by AVRAMOV, AVRAM G, NEJKOV, KHRISTO K, ILIEVA, ELI A, DENEV, PETAR T, STAMENOV, VELICHKO D, KHUBENOV, GEORGI N, IVANOV, IVAN S, DIMITROV, DIMITAR S
Year of Publication 16.04.1990

by STANEVA,MAJA R, ATANASOVA,VIOLETA L, LAZAROVA,ATANASKA D, DASKALOV,PLAMEN M, JANKOV,JANKO M, KHRISTOVA,CVETA KH, ILIEVA,ELI A, IVANOVA,MARIJA N
Year of Publication 15.10.1987

by ATANASOVA,VIOLETA L, STOJANOVA,ELENA.I, MUTAFCZI.ISKI,LJUBOMIR.I, GEORGIEV,ATANAS V, ILIEVA,ELI A, IVANOVA,MARIJA N, CHRISTOVA,.SVETA C
Year of Publication 15.06.1978