**Approximation of functions of more variables with algebraic polynomials in Hausdorff metric,**God. Sof. Univ. Math. Fac.,**63**, (1970), 61-76 (with V. Popov, in Russian).**Approximation of plane curves with polynomial curves,**C. r. Acad. Bulgare Sci.,**23**, (1970), \# 6, 639-642 (with V. Popov, in Russian).**On the approximation with spline functions,**C. r. Acad. Bulgare Sci.,**23**, (1970), n. 7, 755-758 (with V. Popov, in Russian).**Convergence of the derivatives of the linear positive operators,**Izv. Math. Inst. BAS,**11**, (1970), 107- 115 (with B. Penkov, in Bulgarian).**Study of a mathematical model of the regulation of the cellular multiplication,**Izv. Math. Inst. BAS,**11**, (1970), 221-246 (with R. Tzanev, in Bulgarian).**On the classes characterized by the best approximation with the spline functions,**Math. Zametki,**8**, (1970), n. 2, 137-148 (with V. Popov, in Russian).**Approximation relative to Hausdorff distance,**in: Approximation Theory. Ed. by A. Talbot, London and New York Acad. Press, 1970, 101-108.**Prehistoric birth of the computer,**Sp. Kvant, Maskow, (1970),**7**, 3-7;**10**, 8-14 (with N. Rosov, in Russian).**On a Property of a class of Linear Positive Operators,**God. Sof. Univ. Maih. Fac.,**64**, (1971), 115-117 (with B. Bojanov).**Parametric approximation,**God. Sof. Univ. Math. Fac.,**64**, (1971), 237-247 (in Bulgarian).**Possible molecular mechanism for cell differentiation in multicellular organisms,**J. Theoret. Biol., New York,**30**(1971), 337 -393 (with R. Tzanev).**An epigenetic mechanism for carcinogenesis,**Z. Krebsforsch., Berlin,**76**, (1971). 299-319 (with R. Tzanev).**Charls Babbage (1791-1871). In the occasion of 100 years of his death,**Fiz.-math, sp., Sofia,**14**, (1967) n. 4, 331-339.**A generalization of the estimates for the approximation of functions with linear positive operators,**God. Sof. Univ. Math. Fac.,**65**, (1972), 191-200 (with V. Popov, in Russian).**A problem of the labyrinths,**C. r. Acad. Bulgare Sci.,**25**, (1972), \# 5, 583-585 (with T. Bojanov).**On the approximation of functions with spline functions and rational functions,**Trudi Int. Conf., Varna, 19-25 May 1970, BAS, 1972, 89-94 (with V. Popov, in Russian).**Analog of the S. M. Nikolskii's theorem for approximation of functions with algebraic polynomials in Hausdorff metric,**Trudi Int. Conf., Varna, 19-85 May 1970. BAS, 1972, 95-103 (with V. Popov, in Russian).**Exact asymptotic of the best approximation with algebraic and trigonometric polynomials in Hausdorff metric,**Mat. sb., Moscow,**89**, (1972), \# 1, 138-147 (with V. Popov, in Russian).**Hausdorif Metric and its applications,**Intern. Ser. Numer. Math., Basel-Stuttgart,**20**(1972), 127-146 (with B. Penkov).**Convergence of Vall\`ee-Poussin Sums in Hausdorff Distance,**C. r. Acad. Bulgare Sci.,**26**, (1973), n. 11, 1431-1432.**Computer simulation of the regenerative processes in the liver,**in: Liver Regen- eration, MSS Information Corporation, New York, 1973, 174-188 (with R. Tzanev).**On a generalization of Jackson's theorem for best approximation,**J. Approx. Theory.**9**, (1973), n. 3, 102-111 (with V. Popov).**Academician Ljubomir Iliev at 60 years,**Fiz.-math, sp., Sofia,**16**, (1973) n. 4, 1-3 (in Bulgarian).**Order of the best approximation for a class of analytic functions,**C. r. Acad. Bulgare Sci.,**27**, (1974), n.12, 1621-1623 (in Russian).**A method for simultaneous approximate calculation of all positive zeros of an algebraic equation,**Izv. VUZ, Mat., (1974), n. 5, 185-187 (in Bulgarian).**Approximation of Analytic Functions in Hausdorff Metric,**Lecture Nots in Math., Berlin etc., (1974), n. 399, 490-500.**A Mathematical Model of Cellular Differentiation,**in: Mathematical Models in Biology and Medicine. Proc. IFIP-TC 4 Work. Conf., Varna, Bulgaria, 6-11 Sept., 1972, Amsterdam, North- Holland, (1974), 81-92 (with R. Tzanev).**Approximation of Monotone Functions by Monotone Polynomials in Hausdorff's Metric,**Rev. anal. numer. theorie approxim., Cluj,**3**, (1974), n. 1, 79-88 (with V. Popov).**The machine is an amplifier of the human brain,**Sp. September, (1974), n. 9, 136-145 (in Bulgarian).**The mathematics and the contemporary society,**Fiz.-math, sp., Sofia,**17**, (1974), 331-339 (in Bulgarian).**On a modification of Goncar's theorem on the rate of rational approximation,**Math. Zameiki,**17**, (1975), n. 3, 383-390 (in Russian).**Order of best Hausdorff Polynomial Approximation of Certain Functions,**Serdica. (1975). n. 1, 77-78.**Approximations of Semicircles by Algebraic Polynomials,**Trudy Math., Inst. Steclov,**134**, (1975), 315-320; Trudy Math. Inst. AN SSSR,**134**, (1975), 278-282 (in Russian).**Simultaneous approximation of all real zeroes of an algebraic polynomial,**Intern. Ser. Numer. Math., Basel-Stuttgart,**26**, (1975), 131-137.**Hausdorff Approximation of Functions and Point Sets,**In: Topics in Numer. Analysis. Proc. of Royal Irich Acad. Conf. on Numerical Analysis, Dublin 1974. Dublin, Acad. Press, 1975, 175-184.**Hausdorff Approximation of Functions and Point Sets,**Mathematica Balkanica,**4**, (1975), 547-553.**Computation mathematics old and new,**Nauka i izkustvo, Sofia, 1975 (in Bulgarian).**Babbage Charls,**Encyclopedia of Computer Science and Technology,**2**, Marsel Dekker Inc., New York, 1975, 469-479.**The problem of talents in universities,**in: Problem of talents, Ed. Y. Yanev, Partizdat, Sofia, 1975, 201-207 (in Bulgarian).**The 60th Anniversary of Professor L. Iliev,**in: Math. structures, comp. math., math modeling, BAS, Sofia, 1975, 5- 27.**Approximation by algebraic polynomials of functions, which are different from zero only in one point,**God. Sof. Univ. Math. and Mech. Fac.,**67**, (1976), 61-76 (with N. Kjurkchiev, in Bulgarian).**Best Hausdorff Approximation with Equidistant-Knot Spline Functions,**C. r. Acad. Bulgare Sci.,**29**, (1976), n. 12, 1717-1719.**Hausdorff Derivatives in $F_{\Delta}$,**Serdica, (1976), n. 2 131-137 (with B. Penkov and others).**Certain problems of Hausdorff approximation,**in: Theory of function approximation. Moscow**135**, (1976), 322- 329 (in Russian).**Mathematical models of the cellular proliferation and differentiation,**Uspehi Math. Nauk, Moscow,**31**, (1976), n. 3, 255-256 (in Russian).**Metrical dimension and approximation of polynomial curves on the plane,**Serdirca, (1976), n. 2, 295-299 (with T. Bojanov).**Best Hausdorff Approximation with Spline Functions,**Colloq. on Functional Analysis and Approx., Budapest, 1976.**Mathematical models of the processes for cellular proliferation and differentiation.**Publ. Moscow University, 1976.**Mathematical biology,**Fiz.-math, sp., Sofia,**19**, (1976) n. 1, 47-53.**Stare i nove w metodach numerrycznych,**Panstwowe Wydawnictwo Naukowe, 1976.**Numerical methods, part I,**Publ. Nauka i Izkustvo, Sofia, 1976 (with V. Popov).**Exact estimate for the best Hausdorff spline approximation,**C. r. Acad. Bulgare Sci.,**30**, (1977), n. 2, 187-190.**Convergence of sequences of monotone operators in A-distance,**C. r. Acad. Bulgure Sci.,**30**, (1977), n. 5, 657-660.**Segment Arithmetic and Segment Limit,**C. r. Acad. Bulgare Sci.,**30**, (1977), n. 7, 955-958.**Segment Derivatives and Taylor's Formula,**C. r. Acad. Bulgare Sci.,**30**, (1977). n. 8, 1093-1096.**Best Hausdorff approximations by spline functions with equidistant knots,**Pliska, Sofia,**1**, (1977), 79-92.**Some problems for approximation of point sets on the plane,**{\it Mathematica, Cluj. (1977) (in Russian).**Practical mathematical analysis,**Spring Conf. Bulgarian Math. Soc., Varna, 1977 (in Bulgarian).**Some Topics of Segment Analysis,**in: Interval Mathematics, Acad. Press, 1977. 203-222.**Jackson's Type Theorems for One-sided Polynomial Approximation,**C. r. Acad. Bulgare Sci.,**30**, (1977), n. 11, 1533-1536.**Universities and university education,**Fiz.-math, sp., Sofia,**20**, (1977) n. 2, 116--124.**Approximation with monotone operators in A- distance,**in: Linear Spaces and Approximation, Ed. P. L. Butzer and B. Sz. Nagy, ISNM**40**, Basel, 1978, 335-341.**Characterization of the S-derivatives of Lipschitz functions,**Serdica, (1975), n. 4, 260-266 (with S. P. Tashev and P. Petrushev, in Russian).**Numerical methods, part II,**Publ. Nauka i Izkustvo, Sofia, 1978 (with V. Popov, in Bulgarian).**Informatique, ordinateurs et education,**Impact: science et societe,**28**, (1978), n. 3 287-292.**Collaboration of European Universities,**in: Proc.**28**Pugwach Conference, 1978, 212-213.**A scientist has to be certainly a manager,**``Priroda'', Publ. Nauka, Moscow, (1978), 60-64 (in Russian).**Informatics and the other sciences,**Fiz.-math, sp., Sofia,**21**, (1978) n. 1, 41-50.**On a problem of G. I. Marchuk,**Comp. meth. in the math. phis., Novosibirsk,**4**, (1979), 4-10 (in Russian).**Jackson's type theorems for the best one-sided approximations with trigonometric polynomials and spline functions,**Math. Zametki**26**, (1979), n. 5, 791-804 (with A. Andreev and V. Popov, in Russian).**Some estimates for a numerical solution of a boundary problem for ordinary differential equations of a second order,**C. r. Acad. Bulgare Sci.,**32**, (1979), n. 5, 1023-1026 (with A. Andreev and V. Popov).**Hausdorff approximations,**Publ. BAS, Sofia, 1979 (in Bulgarian).**Mathematical analysis I,**Publ. ''Nauka'', Moscow, 1979 (with V. Il'in and V. Sadovnichii, in Russian).**Mathematical analysis 1,**Publ. "Nauka i Izkustvo", Sofia, 1979 (with V. Il'in and V. Sadovnichii, in Bulgarian).

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