by GETOV,IVAN V, TIMOFEEV,BORIS A, KAJJNAKCHIEV,NIKOLA I, MIKOTIN,EVGENIJJ E, GRISHIN,EVGENIJJ K, TONCHEV,KNCHO I, TARASOV,IVAN KH, NIKOLOV,IVAN D, TRIFONOV,TODOR K, GMZOV,NIKOLAJJ KH, KRJUCHATOV,VALERIJJ A, BONCHEV,STILJAN B
Year of Publication 14.08.1987

by KAJJNAKCHIEV,NIKOLA I.,BG, BONCHEV,STILJAN B.,BG, DRAGANOV,KR'STJU G.,BG, STEFANOV,STEFAN I.,BG, POPOV,KRISTIJAN R.,BG, ALEKSANDROV,ALEKSAND'R D.,BG, G'MZOV,NIKOLAJJ KH.,BG, CENKOV,NIKOLA D.,BG
Year of Publication 15.03.1989

by TIMOFEEV,BORIS A, CHERDYNCEV,VLADIMIR N, VAVILOV,IGOR S, MIKOTIN,EVGENIJJ E, TRIFONOV,TODOR K, GMZOV,NIKOLAJJ KH, SNEZHNOJJ,ROSTISLAV L, BURANOV,SAVELIJJ L, BONCHEV,STILJAN B, GETOV,IVAN V, KAJJNAKCHIEV,NIKOLA I, TONCHEV,KNCHO I, SHEVCHENKO,VLADIMIR P, NIKOLOV,IVAN D
Year of Publication 15.05.1985