by ALEKSIEV,ALEKSI C, ATANASOVA,VIOLETA L, ATANASOV,SORIN G
Year of Publication 15.10.1984

by VELCHEV, KONSTANTIN I, ATANASOV, SORIN G, PETKOV, RUMEN I, ATANASOVA, VIOLETA L, KOSTOV, PETAR N
Year of Publication 15.12.1992

by TODOROV,RADOSLAV P, NIKOLOV,TODOR G, ATANASOVA,VIOLETA L, KOSTOV,PETR N, ATANASOV,SORIN G
Year of Publication 16.12.1984

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 TODOROV,RADOSLAV P, NIKOLOV,TODOR G, ATANASOVA,VIOLETA L, KOSTOV,PETR N, ATANASOV,SORIN G
Year of Publication 15.06.1983

by TODOROV,RADOSLAV P, NIKOLOV,TODOR G, ATANASOVA,VIOLETA L, KOSTOV,PETR N, ATANASOV,SORIN G
Year of Publication 14.01.1983

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