%0 Journal Article
%A M. Petrich
%A J.A. Gerhard
%T All varieties of orthogroups.
%J Semigroup forum
%D 1985
%P 311-352
%V 31
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1985__31_134757/
%F SF_1985__31_134757