%0 Journal Article
%A D.A. Bredikhin
%T Varieties  of groupoids associated  with involuted restrictive bisemigroups of binary relations.
%J Semigroup forum
%D 1992
%P 87-92
%V 44
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1992__44_1_135130/
%F SF_1992__44_1_135130