by ENCHEVA,MILKA A, DOBREVA,EKATERINA D, RADEV,SIMEON G, BOSEVSKI,VALENTIN M, KIREV,SIMEON I
Year of Publication 14.11.1987

by ENCHEVA,MILKA A, DOBREVA,EKATERINA D, TRENDAFILOV,ARKADIJJ T, RADEV,SIMEON G, MINCHEV,VESELIN G, BOSEVSKI,VALENTIN M, KIREV,SIMEON I, KARADACHKI,IVAN S
Year of Publication 14.11.1986

by DOBREVA,EKATERINA D.,BG, KARADACHKI,IVAN S.,BG, GAVRILOVA,MARIANA L.,BG, BOSEVSKI,VALENTIN M.,BG, ENCHEVA,MILKA A.,BG, PETROV,KHRISTO B.,BG, KIREV,SIMEON I.,BG, RADEV,SIMEON G.,BG, LIRKOV,ALEKSAND'R L.,BG
Year of Publication 15.08.1988