%0 Journal Article
%A M.V. Sapir
%T On cross semigroup varieties and related questions.
%J Semigroup forum
%D 1991
%P 345-364
%V 42
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1991__42_3_135087/
%F SF_1991__42_3_135087