%0 Journal Article
%A A.N. Petrov
%T The ascending varietal chain of a variety of semigroups.
%J Semigroup forum
%D 1986
%P 157-162
%V 35
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1986__35_134865/
%F SF_1986__35_134865