by POPOV, ENCHO N, PETKOV, PETKO B
Year of Publication 15.11.1989

by RACHEV, DIMITAR A, PETKOV, PETKO B, UGRIN, OGNJAN I
Year of Publication 16.10.1989

by RACHEV,DIMITR A, PETKOV,PETKO B, UGRIN,OGNJAN I
Year of Publication 15.06.1987

by GEORGIEV,GEORGI N, RACHEV,DIMITR A, PETKOV,PETKO B
Year of Publication 15.11.1984

by RACHEV,DIMITR A, PETKOV,PETKO B, UGRIN,OGNJAN I
Year of Publication 15.11.1984

by RACHEV, DIMITAR A, KOPRINKOV, VESELIN D, PETKOV, PETKO B, UGRIN, OGNJAN I
Year of Publication 15.01.1990

by UGRIN,OGNJAN I.,BG, RACHEV,DIMIT'R A.,BG, PETKOV,PETKO B.,BG
Year of Publication 15.03.1989

by PETKOV,PETKO B, RAJJCHEV,DIMITR A
Year of Publication 15.10.1981

by RACHEV,DIMITR A, PETKOV,PETKO B
Year of Publication 15.09.1981

by ADARSKI, PENCHO K, DRENSKI, GEORGI L, PEJCHEV, IVAN P, APOSTOLOV, RUMEN K, NESHEV, NESHO K, KATSAROV, KHRISTO B, POPOV, ENCHO N, PETKOV, PETKO B, NENOV, NENO D, PETKOV, NIKOLAJ M, KHRISTOV, CHAVDAR D, DOBREV, TSVETAN L
Year of Publication 15.08.1990

by PETKOV PETKO P. ,BG
Year of Publication 11.04.1990

by PETKOV PETKO P. ,BG
Year of Publication 13.06.1989

by PETKOV PETKO P. ,BG
Year of Publication 13.06.1989

by PETKOV,PETKO P.,BG, PETROV,CENKO S.,BG
Year of Publication 15.02.1988

by KHRISTOV,KHRISTOFOR P.,BG, GAJJDARDZHIEV,DIMIT'R A.,BG, PETKOV,PETKO N.,BG
Year of Publication 15.05.1989

by PETKOV,PETKO S.,BG, MINDOROVSKI,PAVEL P.,BG, NIKOLOVA,STANKA D.,BG
Year of Publication 14.10.1988

by GOSPODINOV,DOBRI K.,BG, KOJJCHEV,KRASIMIR I.,BG, PETKOV,PETKO A.,BG
Year of Publication 14.10.1988

by BETSCHEV,DIMITER I.,BG, PETKOV,PETKO I.,BG, TOMOV,GEORGI P.,BG
Year of Publication 28.12.1980

by SEVOV,SASHO A.,BG, STAMENOV,JASEN S.,BG, PEEV,PEJU KH.,BG, PETKOV,PETKO I.,BG
Year of Publication 15.03.1989

by CHALEV,DIMIT'R I.,BG, D'GARADIN,DIMIT'R B.,BG, PETKOV,PETKO G.,BG, RUZHIN,VLADIMIR JJ.,BG
Year of Publication 15.12.1988