BG45262
PANAJJOTOV,VLADKO T.,BG, SEMKOV,NIKOLAJJ I.,BG, SHUKEROV,STEFAN A.,BG, KIS'OV,VASIL P.,BG, KONSTANTINOV,GEORGI P.,BG, IVANOVA,LILJANA K.,BG, TUNEV,ANASTAS G.,BG, STAMENOV,STEFAN I.,BG
Year of Publication 15.05.1989
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Year of Publication 15.05.1989
Patent