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

by MARINOV,MARIN P, DEEVSKI,ILIJA I, TOSHEV,VLADIMIR C, BAGAROV,STEFAN T, SERBEZOV,STEFAN A, PETKOV,DIMITR P, GOCZEV,GOCZO T, SANKOV,IVAN T, DO.ICZINOV,STEFAN.I, RACHNEV,BOJAN.I
Year of Publication 10.01.1978

by ARSOV,EMIL S.,BG, GOCEV,VESKO KH.,BG, STANCHEVA,VALENTINA R.,BG, VUCHKOV,ALEKSAND'R K.,BG, PETKOV,DIMIT'R P.,BG, LAZAROV,NIKOLAJJ D.,BG, POPOV,IVAJJLO D.,BG
Year of Publication 15.02.1989