%0 Journal Article
%A K. Takizawa
%T Notes on {Oa}-bands of groupoids.
%J Semigroup forum
%D 1974
%P 155-158
%V 9
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1974__9_134069/
%F SF_1974__9_134069