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, 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