by STOJANOV,KREMEN D.,BG, IVANOV,STANISLAV A.,BG, GROZEV,GROZ'O I.,BG, LAZAROV,MILADIN A.,BG, PAVLOV,GEORGI G.,BG
Year of Publication 15.09.1988

by DIMOV,PETER S.,BG, NANKINOV,IVAN D.,BG, PAVLOV,GEORGI N.,BG, STOJANOV,ATANAS N.,BG
Year of Publication 14.02.1985

by PAVLOV,GEORGI,N.,BG, NANKINOV,IVAN,D.,BG, STOYANOV,ATANAS,N.,BG, DIMOV,PETER,S.,BG
Year of Publication 28.03.1984

by GEORGI NIKOLOV PAVLOV,BG, IVAN DIMITROV NANKINOV,BG, PETR SLAVCHEV DIMOV,BG, ATANAS NIKOLOV STOYANOV,BG
Year of Publication 07.10.1982

by DIMOV,PETER S.,BG, STOLANOV,ATANAS N.,BG, NANKINOV,IVAN D.,BG, PAVLOV,GEORGI N.,BG
Year of Publication 12.04.1984