List of publications:

Ivan Lirkov, Svetozar Margenov, Comparative analysis of BURA based preconditioning of fractional Laplacian, Application of mathematics in technical and natural sciences, AMiTaNS’22, AIP Conference Proceedings, 2953, American Institute of Physics, 2023, 090003-1-090003-7, doi:10.1063/5.0177564.
Ivan Lirkov, Marcin Paprzycki, Maria Ganzha, Performance Analysis of a 3D Elliptic Solver on Intel Xeon Computer System, Proceedings of the 18th Conference on Computer Science and Intelligence Systems, M. Ganzha, L. Maciaszek, M. Paprzycki, D. Ślęzak (eds). ACSIS, Vol. 35, 1053-1058 (2023), doi:10.15439/2023F5683.
Amelia Bădică, Costin Bădică, Marek Bolanowski, Stefka Fidanova, Maria Ganzha, Stanislav Harizanov, Mirjana Ivanovic, Ivan Lirkov, Marcin Paprzycki, Andrzej Paszkiewicz, Kacper Tomczyk, Cascaded Anomaly Detection with Coarse Sampling in Distributed Systems, Big-Data-Analytics in Astronomy, Science, and Engineering, Sachdeva S., Watanobe Y., Bhalla S. (eds) Lecture notes in computer science, 13167, Springer, 2022, 181-200, doi:10.1007/978-3-030-96600-3_13.
Stanislav Harizanov, Nikola Kosturski, Ivan Lirkov, Svetozar Margenov, Yavor Vutov, Reduced Sum Implementation of the BURA Method for Spectral Fractional Diffusion Problems, Large-Scale Scientific Computing, I. Lirkov, S. Margenov eds., Lecture notes in computer science, 13127, Springer, 2022, 57-64, doi:10.1007/978-3-030-97549-4_6.
Stanislav Harizanov, Ivan Lirkov, Svetozar Margenov, Rational Approximations in Robust Preconditioning of Multiphysics Problems, Mathematics, 10 (5), 2022, art. no. 780, doi:10.3390/math10050780
Elie Saad, Marcin Paprzycki, Maria Ganzha, Amelia Bădică, Costin Bădică, Stefka Fidanova, Ivan Lirkov, Mirjana Ivanović, Generalized Zero-Shot Learning for Image Classification—Comparing Performance of Popular Approaches, Information, 13(12), 561, 2022, doi:10.3390/info13120561.
Rafał Adasiewicz, Maria Ganzha, Marcin Paprzycki, Mirjana Ivanovic, Costin Badica, Ivan Lirkov, Stefka Fidanova, Stanislav Harizanov, Optimal Placement of Internet of Things Infrastructure in a Smart Building, Lecture Notes in Networks and Systems, 166, Springer, 2021, 661-669, doi:10.1007/978-981-15-9689-6_73
Nikola Kosturski, Stanislav Harizanov, Ivan Lirkov, Svetozar Margenov, Yavor Vutov, Reduced Multiplicative (BURA-MR) and Additive (BURA-AR) Best Uniform Rational Approximation Methods and Algorithms for Fractional Elliptic Equations, Fractal and Fractional, 5(3), 2021, art. no. 61, doi:10.3390/fractalfract5030061
Ivan Lirkov, Stanislav Harizanov, Marcin Paprzycki, Maria Ganzha, Performance analysis of parallel high-resolution image restoration algorithms on Intel supercomputer, Concurrency and Computation: Practice and Experience, 33 (4), 2021, e5996, doi:10.1002/cpe.5996.
Ivan Lirkov, Performance Analysis of a Parallel Denoising Algorithm on Intel Xeon Computer System, Parallel Processing and Applied Mathematics, PPAM 2019, Wyrzykowski R., Deelman E., Dongarra J., Karczewski K. (eds), Lecture notes in computer science, 12044, Springer, 2020, 93-100, doi:10.1007/978-3-030-43222-5_8.
Ivan Lirkov, Performance Analysis Of A Scalable Algorithm For 3D Linear Transforms On Supercomputer With Intel Processors/co-processors, Cybernetics and information technologies, 20 (6), 2020, 94-104, doi:10.2478/cait-2020-0064.
Ivan Lirkov, Svetozar Margenov, Applications-driven approach to evaluate HPC efficiency and convergence of HPC and AI in a Big Data environment, Knowledge, Language & Models, INCOMA Ltd. Shoumen, Bulgaria, 2020, 193-207.
Yavor Vutov, Daniel Nikolov, Ivan Lirkov, Krassimir Georgiev, Computer simulation of a saline enhanced radio-frequency hepatic ablation process, Large-Scale Scientific Computing, I. Lirkov, S. Margenov eds., Lecture notes in computer science, 11958, Springer, 2020, 382-390, doi:10.1007/978-3-030-41032-2_44.
Maria Ganzha, Ivan Lirkov, Marcin Paprzycki, Performance analysis of hybrid parallel solver for 3D Stokes equation on Intel Xeon computer system, Applications of Mathematics in Technical and Natural Sciences, AMiTaNS 2019, Michail D. Todorov (Ed.), AIP Conference Proceedings, 2164, American Institute of Physics, 2019, 120003, doi:10.1063/1.5130863.
Arkadiusz Załuski, Maria Ganzha, Marcin Paprzycki, Costin Bădică, Amelia Bădică, Mirjana Ivanovic, Stefka Fidanova, Ivan Lirkov, Experimenting with facilitating collaborative travel recommendations, 23rd International Conference on System Theory, Control and Computing (ICSTCC), IEEE, 2019, 260-265, doi:10.1109/ICSTCC.2019.8885795.
Jakub Fijałkowski, Maria Ganzha, Marcin Paprzycki, Stefka Fidanova, Ivan Lirkov, Costin Bădică, Mirjana Ivanovic, Mining Smartphone Generated Data for User Action Recognition - Preliminary Assessment, Applications of Mathematics in Technical and Natural Sciences, AMiTaNS 2018, Michail D. Todorov (Ed.), AIP Conference Proceedings, 2025, American Institute of Physics, 2018, 090001-1-090001-18, doi:10.1063/1.5064928.
Rafał Szczekutek, Maria Ganzha, Marcin Paprzycki, Stefka Fidanova, Ivan Lirkov, Costin Bădică, Mirjana Ivanovic, System for semantic technology-based access management in a port terminal, Applications of Mathematics in Technical and Natural Sciences, AMiTaNS 2018, Michail D. Todorov (Ed.), AIP Conference Proceedings, 2025, American Institute of Physics, 2018, 090002-1-090002-17, doi:10.1063/1.5064929.
Sando George, Maria Ganzha, Marcin Paprzycki, Stefka Fidanova, Ivan Lirkov, Building a Platform to Collect Crowdsensing Data: Preliminary Considerations, Applications of Mathematics in Technical and Natural Sciences, AMiTaNS 2017, Michail D. Todorov (Ed.), AIP Conference Proceedings, 1895, American Institute of Physics, 2017, 100002-1-100002-14, doi:10.1063/1.5007406.
Stanislav Harizanov, Ivan Lirkov, Krassimir Georgiev, Marcin Paprzycki, Maria Ganzha, Performance analysis of a parallel algorithm for restoring large-scale CT images, Journal of Computational and Applied Mathematics, 310, Elsevier, 2017, 104-114, doi:10.1016/j.cam.2016.07.001.
Katarzyna Wasielewska, Maria Ganzha, Marcin Paprzycki, Costin Bădică, Mirjana Ivanovic, Ivan Lirkov, Stefka Fidanova, Agents in grid extended to clouds, Applications of Mathematics in Technical and Natural Sciences, AMiTaNS 2016, Michail D. Todorov (Ed.), AIP Conference Proceedings, 1773, American Institute of Physics, 2016, 070002-1-070002-9, doi:10.1063/1.4964984.
Zahari Zlatev, Ivan Dimov, Ivan Lirkov, Efficient numerical methods for large-scale scientific computations: Introduction, Journal of Computational and Applied Mathematics, 293, Elsevier, 2016, 1-6, doi:10.1016/j.cam.2015.05.001.
Maria Ganzha, Krassimir Georgiev, Marcin Paprzycki, Ivan Lirkov, An application of partition method for solving 3D Stokes equation, Computers & Mathematics with Applications, 70, 11, 2015, 2762-2772, doi:10.1016/j.camwa.2015.04.025.
Nikola Kosturski, Ivan Lirkov, Svetozar Margenov, Yavor Vutov, Thermoelectrical Tick Removal Process Modeling, Large-Scale Scientific Computing, I. Lirkov, S. Margenov, J. Waśniewski eds., Lecture notes in computer science, 9374, Springer, 2015, 369-376, doi:10.1007/978-3-319-26520-9_41.
Katarzyna Wasielewska, Maria Ganzha, Marcin Paprzycki, Costin Bădică, Mirjana Ivanovic, Ivan Lirkov, Semantic technologies in a decision support system, Application of mathematics in technical and natural sciences, Michail Todorov ed., AIP Conference Proceedings, 1684, 2015, 060002-1-060002-12, doi:10.1063/1.4934301.
Ivan Lirkov, Marcin Paprzycki, Maria Ganzha, Stanislav Sedukhin, Paweł Gepner, Performance analysis of scalable algorithms for 3D linear transforms, Annals of Computer Science and Information Systems, Volume 2, Proceedings of the 2014 Federated Conference on Computer Science and Information Systems, M. Ganzha, L. Maciaszek, M. Paprzycki eds., IEEE, 2014, 613-622, doi:10.15439/2014F374.
Paweł Szmeja, Katarzyna Wasielewska, Maria Ganzha, Michał Drozdowicz, Marcin Paprzycki, Stefka Fidanova, Ivan Lirkov, Reengineering and Extending the Agents in Grid Ontology, Large-Scale Scientific Computing, I. Lirkov, S. Margenov, J. Waśniewski eds., Lecture notes in computer science, 8353, Springer, 2014, 565-573, doi:10.1007/978-3-662-43880-0_65.
Katarzyna Wasielewska, Maria Ganzha, Marcin Paprzycki, Costin Bădică, Mirjana Ivanovic, Ivan Lirkov, Multicriteria analysis of ontologically represented information, Application of mathematics in technical and natural sciences, Michail Todorov ed., AIP Conference Proceedings, 1629, 2014, 281-295, doi:10.1063/1.4902284.
Katarzyna Wasielewska, Maria Ganzha, Marcin Paprzycki, Paweł Szmeja, Michał Drozdowicz, Ivan Lirkov, Costin Bădică, Applying Saaty’s Multicriterial Decision Making Approach in Grid Resource Management, Information Technology and Control, 43, No 1, 2014, 73-87, doi:10.5755/j01.itc.43.1.4587.
Maria Ganzha, Ivan Lirkov, Marcin Paprzycki, Comparative analysis of high performance solvers for solving Stokes equation, Application of Mathematics in Technical and Natural Sciences, AMiTaNS 2013, Michail D. Todorov ed., AIP Conference Proceedings, 1561, 2013, 347-354, doi:10.1063/1.4827245.
Ivan Lirkov, Marcin Paprzycki, Maria Ganzha, Paweł Gepner, Performance Evaluation of MPI/OpenMP Algorithm for 3D Time Dependent Problems, Annals of Computer Science and Information Systems, Volume 2, Position Papers of the Federated Conference on Computer Science and Information Systems, M. Ganzha, L. Maciaszek, M. Paprzycki (editors), 2013, 27-32.
Katarzyna Wasielewska, Maria Ganzha, Marcin Paprzycki, Ivan Lirkov, Developing Ontological Model of Computational Linear Algebra - Preliminary Considerations, Application of Mathematics in Technical and Natural Sciences, AMiTaNS 2013, Michail D. Todorov ed., AIP Conference Proceedings, 1561, 2013, 133-143, doi:10.1063/1.4827222.
Maria Ganzha, Nikola Kosturski, and Ivan Lirkov, Improving the efficiency of parallel alternating directions algorithm for time dependent problems, Application of Mathematics in Technical and Natural Sciences, Michail D. Todorov ed., AIP Conference Proceedings, 1487, 2012, 322-328, doi:10.1063/1.4758974.
Ivan Lirkov, Marcin Paprzycki, Maria Ganzha, Performance Analysis of Parallel Alternating Directions Algorithm for Time Dependent Problems, 9th international conference on Parallel Processing and Applied Mathematics, PPAM 2011, Part I, Roman Wyrzykowski, Jack Dongarra, Konrad Karczewski, Jerzy Waśniewski eds., Lecture notes in computer science, 7203, Springer, 2012, 173-182, doi:10.1007/978-3-642-31464-3_18.
Katarzyna Wasielewska, Michał Drozdowicz, Paweł Szmeja, Maria Ganzha, Marcin Paprzycki, Ivan Lirkov, Dana Petcu, Costin Badica, Agents in Grid System - Design and Implementation, Large-Scale Scientific Computing, I. Lirkov, S. Margenov, J. Waśniewski eds., Lecture notes in computer science, 7116, Springer, 2012, 662-669, doi:10.1007/978-3-642-29843-1_76.
M. Drozdowicz, K. Wasielewska, M. Ganzha, M. Paprzycki, N. Attaui, I. Lirkov, R. Olejnik, D. Petcu, C. Badica, Ontology for contract negotiations in agent-based grid resource management system, Trends in Parallel, Distributed, Grid and Cloud Computing for Engineering, P. Iványi, B. Topping eds., Saxe-Coburg Publications, Stirlingshire, UK, 2011, 335-354, doi:10.4203/csets.27.15.
Maria Ganzha, Krassimir Georgiev, Ivan Lirkov, Svetozar Margenov, Marcin Paprzycki, Highly parallel alternating directions algorithm for time dependent problems, Application of Mathematics in Technical and Natural Sciences, M. Todorov, C. Christov eds., AIP Conf. Proc. 1404, 2011, 210-217, doi:10.1063/1.3659922.
Ivan Lirkov and Stanislava Stoilova, The b-adic Diaphony as a Tool to Study Pseudo-randomness of Nets, Numerical Methods & Applications, I. Dimov, S. Dimova, N. Kolkovska eds., Lecture notes in computer science, 6046, Springer, 2011, 68-76, doi:10.1007/978-3-642-18466-6_7.
Ivan Lirkov, Marcin Paprzycki, Maria Ganzha, Paweł Gepner, Parallel alternating directions algorithm for 3D Stokes equation, Proceedings of the Federated Conference on Computer Science and Information Systems, M. Ganzha, L. Maciaszek, M. Paprzycki eds., IEEE Computer Society Press, 2011, 443-450.
K. Wasielewska, M. Drozdowicz, M. Ganzha, M. Paprzycki, N. Attaui, D. Petcu, C. Badica, R. Olejnik, I. Lirkov, Negotiations in an agent-based grid resource brokering systems, Trends in Parallel, Distributed, Grid and Cloud Computing for Engineering, P. Iványi, B. Topping eds., Saxe-Coburg Publications, Stirlingshire, UK, 2011, 355-374, doi:10.4203/csets.27.16.
M. Drozdowicz, M. Ganzha, M. Paprzycki, K. Wasielewska, I. Lirkov, R. Olejnik, N. Attaoui, Utilization of Modified CoreGRID Ontology in an Agent-based Grid Resource Management System, Proceedings of the CATA 2010 Conference, ISCA Press, 2010, 240-245.
Maria Ganzha, Marcin Paprzycki, Michal Drozdowicz, Mehrdad Senobari, Ivan Lirkov, Sofiya Ivanovska, Richard Olejnik, and Pavel Telegin, Information Flow and Mirroring in an Agent-Based Grid Resource Brokering System, Large-Scale Scientific Computing, I. Lirkov, S. Margenov, J. Waśniewski eds., Lecture notes in computer science, 5910, Springer, 2010, 475-482, doi:10.1007/978-3-642-12535-5_56.
Ivan Lirkov, Yavor Vutov, Marcin Paprzycki, Maria Ganzha, Parallel Performance Evaluation of MIC(0) Preconditioning Algorithm for Voxel μFE Simulation, Parallel processing and applied mathematics, Part II, R. Wyrzykowski, J. Dongarra, K. Karczewski, J. Waśniewski eds., Lecture notes in computer science, 6068, Springer, 2010, 135-144, doi:10.1007/978-3-642-14403-5_15.
Ivan Lirkov, Stanislava Stoilova, Analysis of Pseudo-Random Properties of Nonlinear Congruential Generators with Power of Two Modulus by Numerical Computing of the b-adic Diaphony, Proceedings of the International Multiconference on Computer Science and Information Technology, Volume 5, M. Ganzha, M. Paprzycki eds., IEEE Computer Society Press, Los Alamitos, USA, 2010, 309-316.
Michal Drozdowicz, Maria Ganzha, Marcin Paprzycki, Richard Olejnik, Ivan Lirkov, Pavel Telegin, and Mehrdad Senobari, Ontologies, Agents and the Grid: an Overview, Parallel, Distributed and Grid Computing for Engineering, Computational Science, Engineering and Technology Series: 21, Saxe-Coburg Publications, Stirlingshire, UK, Chapter 7, (2009), 117-140, doi:10.4203/csets.21.7.
Stefka Fidanova and Ivan Lirkov, 3D protein structure prediction, J. Analele Universitatii de Vest Timisoara, Seria Matematica-Informatica, XLVII(2), (2009), 33-46.
Maria Ganzha, Marcin Paprzycki, Michal Drozdowicz, Mehrdad Senobari, Ivan Lirkov, Sofiya Ivanovska, Richard Olejnik, and Pavel Telegin, Mirroring information within an agent-team-based intelligent Grid middleware; an overview and directions for system development, Scalable Computing: Practice and Experience, 10(4), 2009, 397-411.
Ivan Lirkov, Yavor Vutov, Marcin Paprzycki, and Maria Ganzha, Comparative Analysis of High Performance Solvers for 3D Elasticity Problems, Numerical Analysis and Its Applications, S. Margenov, L. Vulkov, J. Waśniewski eds., Lecture notes in computer science, 5434, Springer, 2009, 392-399, doi:10.1007/978-3-642-00464-3_44.
Mehrdad Senobari, Michal Drozdowicz, Maria Ganzha, Marcin Paprzycki, Richard Olejnik, Ivan Lirkov, Pavel Telegin, and N. M. Charkari, Resource Management in Grids: Overview and a discussion of a possible approach for an Agent-Based Middleware, Parallel, Distributed and Grid Computing for Engineering, Computational Science, Engineering and Technology Series: 21, Saxe-Coburg Publications, Stirlingshire, UK, Chapter 8, (2009), 141-164, doi:10.4203/csets.21.8.
Mateusz Dominiak, Maria Ganzha, Maciej Gawinecki, Wojciech Kuranowski, Marcin Paprzycki, Svetozar Margenov, Ivan Lirkov, Utilizing Agent Teams in Grid Resource Brokering, International Transactions on Systems Science and Applications, 3 4, 2008, 296-306.
M. Drozdowicz, M. Ganzha, W. Kuranowski, M. Paprzycki, I. Alshabani, R. Olejnik, M. Taifour, M. Senobari, and I. Lirkov, Software Agents in ADAJ: Load Balancing in a Distributed Environment, Applications of Mathematics in Engineering and Economics'34, M. Todorov ed., AIP Conf. Proc., 1067, American Institute of Physics, 2008, 527-540, doi:10.1063/1.3030827.
Stefka Fidanova and Ivan Lirkov, Ant Colony System Approach for Protein Folding, Proceedings of the International Multiconference on Computer Science and Information Technology, Volume 3, M. Ganzha, M. Paprzycki, T. Pełech-Pilichowski eds., 2008, 887-891.
Wojciech Kuranowski, Maria Ganzha, Marcin Paprzycki, and Ivan Lirkov, Supervising Agent Team an Agent-based Grid Resource Brokering System - Initial Solution, Proceedings of the Conference on Complex, Intelligent and Software Intensive Systems, F. Xhafa, L. Barolli, eds., IEEE CS Press, Los Alamitos, CA, 2008, 321-326.
Wojciech Kuranowski, Maria Ganzha, Maciej Gawinecki, Marcin Paprzycki, Ivan Lirkov, and Svetozar Margenov, Forming and Managing Agent Teams Acting as Resource Brokers in the Grid-Preliminary Considerations, International Journal of Computational Intelligence Research, 4 1, 2008, 9-16.
Wojciech Kuranowski, Marcin Paprzycki, Maria Ganzha, Maciej Gawinecki, Ivan Lirkov, Svetozar Margenov, Agents as Resource Brokers in Grids - Forming Agent Teams, Large-Scale Scientific Computing, I. Lirkov, S. Margenov, J. Waśniewski eds., Lecture notes in computer science, 4818, Springer, 2008, 484-491, doi:10.1007/978-3-540-78827-0_55.
Ivan Lirkov, Yavor Vutov, Marcin Paprzycki, Maria Ganzha, Benchmarking Performance Analysis of Parallel Solver for 3D Elasticity Problems, Large-Scale Scientific Computing, I. Lirkov, S. Margenov, J. Waśniewski eds., Lecture notes in computer science, 4818, Springer, 2008, 705-712, doi:10.1007/978-3-540-78827-0_81.
Mehrdad Senobari, Michal Drozdowicz, Marcin Paprzycki, Wojciech Kuranowski, Maria Ganzha, Richard Olejnik, Ivan Lirkov, Combining a JADE-Agent-Based Grid Infrastructure with the Globus Middleware - Initial Solution, Computational Intelligence for Modelling, Control and Automation, M. Mohammadian ed., IEEE Computer Society Press, Los Alamitos, USA, 2008, 895-900, doi:10.1109/CIMCA.2008.158.
Maria Ganzha, Marcin Paprzycki, Ivan Lirkov, Trust Management in an Agent-Based Grid Resource Brokering System-Preliminary Considerations, Applications of mathematics in engineering and economics'33, M. Todorov ed., AIP Conf. Proc., 946, American Institute of Physics, 2007, 35-46, doi:10.1063/1.2806037.
Krassimir Georgiev, Ivan Lirkov, Nikola Kosturski, Svetozar Margenov, On the computer simulation of heat and mass transfer in vacuum freeze-drying, Proceedings of the International Multiconference on Computer Science and Information Technology, Volume 2, M. Ganzha, M. Paprzycki, T. Pełech-Pilichowski eds., 2007, 493-502.
János Karátson, Tamás Kurics, Ivan Lirkov, A Parallel Algorithm for Systems of Convection-Diffusion Equations, Numerical Methods and Applications, T. Boyanov, S. Dimova, K. Georgiev, G. Nikolov eds., Lecture Notes in Computer Science, 4310, Springer, 2007, 65-73, doi:10.1007/978-3-540-70942-8_7.
Ivan Lirkov, Yavor Vutov, Comparative Analysis of High Performance Solvers for 3D Elliptic Problems, Proceedings of the International Multiconference on Computer Science and Information Technology, Volume 2, M. Ganzha, M. Paprzycki, T. Pełech-Pilichowski eds., 2007, 483-492.
Ivan Lirkov and Yavor Vutov, The convergence rate and parallel performance of a 3D elliptic solver, Systems science, 32, No. 4, 2007, 73-81.
Ivan Lirkov and Yavor Vutov, Parallel Performance of a 3D Elliptic Solver, Proceedings of the International Multiconference on Computer Science and Information Technology, Volume 1, M. Ganzha, M. Paprzycki, J. Wachowicz, K. Węcel eds., (CD-ROM), ISSN 1896-7094, 2006, 579-590.
Ivan Lirkov, Svetozar Magenov, Marcin Paprzycki, Benchmarking Performance of an MPI-based Solver for 3D Elasticity Problems, Proceedings of IEEE John Vincent Atanasoff 2006 International Symposium on Modern Computing, IEEE Computer Society, 2006, 260-265.
Ivan Lirkov, Parallel Performance of a 3D Elliptic Solver, Numerical Analysis and Its Applications, Zhilin Li, Lubin Vulkov, Jerzy Waśniewski eds., Lecture Notes in Computer Science, 3401, Springer, 2005, 383-390, doi:10.1007/978-3-540-31852-1_46.
Ivan Lirkov, Parallel Performance of an MPI Solver for 3D Elasticity Problems, Numerical methods and applications, I. Dimov, I. Lirkov, S. Margenov, Z. Zlatev eds., Lecture Notes in Computer Science, 2542, Springer, 2003, 527-535, doi:10.1007/3-540-36487-0_60.
Ivan Lirkov, MPI solver for 3D elasticity problems, Mathematics and computers in simulation, 61 3-6, 2003, 509-516, doi:10.1016/S0378-4754(02)00104-0.
Ivan Lirkov, Svetozar Margenov, Marcin Paprzycki, Parallel Performance of a 3D Elliptic Solver, Numerical Analysis and Its Applications, Lubin Vulkov, Plamen Yalamov, Jerzy Waśniewski eds., Lecture Notes in Computer Science, 1988, Springer, 2001, 535-543, doi:10.1007/3-540-45262-1_63.
Ivan Lirkov, Algebraic two-level preconditioning of non-conforming rotated trilinear FEM systems, Proceedings of the XIIIth summer school "Software and algorithms of numerical mathematics", Nectiny, Czech Republic, 1999, 209-222.
Ivan Lirkov, Svetozar Margenov, Marcin Paprzycki, John McLaughlin, Parallel Conjugate Gradient Method with Circulant Block-Factorization Preconditioners for 3D Elliptic Problems, Proceedings of the Ninth SIAM Conference on Parallel Processing for Scientific Computing, B. Hendrickson et. al. eds., SIAM, Philadelphia, 1999, files Marcin~1.pdf and Marcin~1.ps
Ivan Lirkov, Svetozar Margenov, Marcin Paprzycki, Benchmarking performance of parallel computers using a 2D elliptic solver, Recent advances in numerical methods and applications, O. Iliev, M. Kaschiev, S. Margenov, Bl. Sendov, P. Vassilevski eds., World Scientific, 1999, 491-499.
Ivan Lirkov, Svetozar Margenov, Parallel complexity of conjugate gradient method with circulant block-factorization preconditioners for 3D elliptic problems, Recent advances in numerical methods and applications, O. Iliev, M. Kaschiev, S. Margenov, Bl. Sendov, P. Vassilevski eds., World Scientific, 1999, 482-490.
Ivan Lirkov, Svetozar Margenov, MPI parallel implementation of CBF preconditioning for 3D elasticity problems, Mathematics and computers in simulation, 50 1-4, 1999, 247-254 doi:10.1016/S0378-4754(99)00084-1.
Ivan Lirkov, Svetozar Margenov, Marcin Paprzycki, Parallel solution of 2D elliptic PDE's on Silicon Graphics supercomputers, Proceedings of the 10th IASTED International Conference on Parallel and Distributed Computing and Systems, Las Vegas, Nevada, IASTED Press, Calgary, 1998, 575-580.
Ivan Lirkov, Svetozar Margenov, Marcin Paprzycki, R. Owens, A shared memory parallel implementation of block-circulant preconditioners, Large-Scale Scientific Computations of Engineering and Environmental problems, M. Griebel, O. Iliev, S. Margenov, P. Vassilevski eds., Notes on Numerical Fluid Mechanics, 62, Vieweg Verlag, Braunschweig, Germany, 1998, 319-327.

Ivan Lirkov, Svetozar Margenov, Ludmil Zikatanov, Circulant block-factorization preconditioning of anisotropic elliptic problems, Computing, 58 (3), 1997, 245-258, doi:10.1007/BF02684392.

Ivan Lirkov, Svetozar Margenov, Displacement decomposition circulant preconditioners for almost incompressible 2D elasticity systems, Numerical Analysis and Its Application, Lubin Vulkov, Jerzy Waśniewski, Plamen Yalamov eds., Lecture Notes in Computer Science, 1196, Springer, 1997, 292-299, doi:10.1007/3-540-62598-4_106.
Ivan Lirkov, Svetozar Margenov, Parallel Complexity of Conjugate Gradient Method with Circulant Preconditioners, in: Proceedings of the PARCELLA'96, R. Vollmar, W. Erhard, V. Jossifov, eds., Akademie Verlag, Berlin, 1996, 279-286.
Ivan Lirkov, Svetozar Margenov, On circulant preconditioning of elliptic problems in L-shaped domain, in: Advances in Numerical Methods and Applications I.T. Dimov, Bl. Sendov, P.S. Vassilevski eds., World Scientific, 1994, 136-145.
Ivan Lirkov, Svetozar Margenov, Panayot Vassilevski, Circulant block-factorization preconditioners for elliptic problems, Computing, 53 (1), 1994, 59-74, doi:10.1007/BF02262108.
Ivan Lirkov, Svetozar Margenov, Circulant Preconditioning of Second Order Up-wind Approximation of Advection Problems, Scientific Computation and Mathematical Modeling, edited by S. M. Markov, Datecs Publishing, Sofia, 1993, 73-76.
Svetozar Margenov, Ivan Lirkov, Preconditioned Conjugate Gradient Iterative Algorithms for Transputer Based Systems, WP&DP'93, Parallel and Distributed Processing, K. Boyanov (Editor), Sofia, 1993, 406-415.
Ivan Lirkov, Circulant Preconditioners for Spline Finite Element Elliptic Systems, Comptes rendus de l'Academie bulgare des Sciences, 46 (3), 1993, 21-24.

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