by TAKOV,IVAN M, NANKOV,DIMITR B, KLOCHKOVA,KRISTINA S, IVANOV,BORIS K, ZAKHARIEV,VLADIMIR A, NIKOLOV,ASEN G
Year of Publication 15.03.1985

by TAKOV,IVAN M, NANKOV,DIMITR B, MALINOV,STOJJNE T, TEKEV,SBIN G, DOJJCHINOV,GEORGI D, SERAFIMOV,TODOR B, IVANOV,BORIS K, PARASHIKOV,PETR KH
Year of Publication 15.07.1983