by ARSOV, EMIL S, LAZAROV, NIKOLAJ D, ZHEKOV, KRASIMIR ZH, VUCHKOV, ALEKSANDAR K, RASHEV, TSOLO V, PENOV, GEORGI D, GOTSEV, VESKO KH, POPOV, IVAJLO D, BOGEV, PAVEL V
Year of Publication 15.05.1990

by LAZAROV, NIKOLAJ D, ARSOV, EMIL S, ZHEKOV, KRASIMIR ZH, VUCHKOV, ALEKSANDAR K, RASHEV, TSOLO V, PENOV, GEORGI D, GOTSEV, VESKO KH, POPOV, IVAJLO D, BOGEV, PAVEL V
Year of Publication 15.05.1990

by STANCHEVA,VALENTINA R.,BG, BOGEV,PAVEL V.,BG, ZHEKOV,KRASIMIR ZH.,BG, GEORGIEV,BOJAN A.,BG, POPOV,IVAJJLO D.,BG, ZLATKOV,KHRISTOFOR M.,BG
Year of Publication 15.06.1989

by ARSOV,EMIL S.,BG, BOGEV,PAVEL V.,BG, GRIGOROVA,NADEZHDA G.,BG, PESHEV,VALENTIN K.,BG, MALCHEVA,IRENA B.,BG
Year of Publication 15.11.1988

by ZHEKOV,KRASIMIR ZH, LAZAROV,NIKOLAJJ D, GOCEV,VESKO KH, TAKEV,ASPARUKH S, ANEV,MILCHO S, BOGEV,PAVEL V, VUCHKOV,ALEKSANDR K, ARSOV,EMIL S, PETKOV,DIMITR P
Year of Publication 15.10.1986