%0 Journal Article
%A E. V. Sukhanov
%T The groupoid of varieties of idempotent semigroups.
%J Semigroup forum
%D 1977
%P 143-160
%V 14
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1977__14_186363/
%F SF_1977__14_186363