%0 Journal Article %A G. U. Oganesyan %T On the problems of equality and divisibility of words in a~semigroup with a~defining relation of the from %J Izvestiya. Mathematics %D 1978 %P 557-566 %V 12 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/item/IM2_1978_12_3_a7/ %G en %F IM2_1978_12_3_a7