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Constructive function theory; proceedings of the international conference on constructive function theory, Golden Sands (Varna), May 19-25, 1970 / edited by B. Penkov and D. Va?ov.
Sofia : Bulgarian Academy of Sciences , 1972
Books
Stability problems for stochastic models : proceedings of the 9th International Seminar held in Varna, Bulgaria, May 13-19, 1985 / edited by V.V. Kalashnikov, B. Penkov and V.M. Zolotarev
: gw,: us. - Berlin ; Tokyo : Springer-Verlag , c1987. - (Lecture notes in mathematics ; 1233)