by MINCHEV,VESELIN G, PETROV,SAVKO T, RIBAREVA,JJORDANKA P, KIRILOV,KIRIL L, RIBAREV,BOZHIDAR P
Year of Publication 15.07.1986

by RIBAREVA; BORYANA B, POPOV; HRISTO D, KIRILOV; KIRIL L, PETROV; SAVKO T, RIBAREVA; YORDANKA P, MINTCHEV; VESELIN G, RIBAREV; BOJIDAR P
Year of Publication 01.11.1988

by POPOV,KHRISTO D, MINCHEV,VESELIN G, PETROV,SAVKO T, RIBAREVA,JJORDANKA P, KIRILOV,KIRIL L, RIBAREVA,BORJANA B, RIBAREV,BOZHIDAR P
Year of Publication 14.08.1987

by POPOV,KHRISTO D, MINCHEV,VESELIN G, PETROV,SAVKO T, RIBAREVA,JJORDANKA P, KIRILOV,KIRIL L, RIBAREVA,BORJANA B, RIBAREV,BOZHIDAR P
Year of Publication 15.10.1986

by POPOV CHRISTO D.,BG, RIBAREV BOZIDAR P. ,BG, RIBAREVA JORDANKA P.,BG, MINCEV VESELIN G. ,BG, RIBAREVA BORJANA B.,BG, PETROV SAVKO T. ,BG, KIRILOV KIRIL L. ,BG
Year of Publication 12.02.1990

by POPOV,HRISTO D.,BG, PETROV,SAVKO T.,BG, MINTCHEV,VESELIN G.,BG, KIRILOV,KIRIL L.,BG, RIBAREV,BOJIDAR P.,BG, RIBAREVA,BORYANA B.,GB, RIBAREVA,YORDANKA P.,BG
Year of Publication 05.04.1989

by POPOV CHRISTO D.,BG, RIBAREV BOZIDAR P. ,BG, RIBAREVA JORDANKA P.,BG, MINCEV VESELIN G. ,BG, RIBAREVA BORJANA B.,BG, PETROV SAVKO T. ,BG, KIRILOV KIRIL L. ,BG
Year of Publication 15.11.1988

by POPOV CHRISTO D.,BG, RIBAREV BOZIDAR P. ,BG, RIBAREVA JORDANKA P.,BG, MINCEV VESELIN G. ,BG, RIBAREVA BORJANA B.,BG, PETROV SAVKO T. ,BG, KIRILOV KIRIL L. ,BG
Year of Publication 15.11.1988