by GESHEV,TOTJU A.,BG, DIMITROV,DIMIT'R N.,BG
Year of Publication 15.06.1989

by GESHEV,TOTJU A.,BG, DIMITROV,DIMIT'R N.,BG
Year of Publication 15.07.1988

by MANOVA,SVETLA K.,BG, UZUNOVA,JJOANNA P.,BG, DIMITROV,DIMIT'R N.,BG, PANAJJOTOV,NAUM P.,BG
Year of Publication 15.02.1988

by GJUZELEV,LJUBEN G.,BG, ATANASOV,GEORGI M.,BG, AS'RLAKJAN,AGOP KH.,BG, HHEREVA,RADKA D.,BG, DIMITROV,DIMIT'R N.,BG, OMAR,ABDEL K.,IQ
Year of Publication 15.06.1989

by DOBREVA,SVOBODA A.,BG, VASILEVA,MARGARITA V.,BG, BRESKOVSKA,KERACHKA G.,BG, DIMITROV,DIMIT'R N.,BG, SHISHKOVA,ZDRAVKA N.,BG
Year of Publication 15.01.1988

by ALEXANDROV VELICKO G. ,BG, DIMITROV DIMITR N. ,BG, KONSTATINOV MARIN B.,BG
Year of Publication 13.12.1989