%0 Journal Article
%A J.E. McMorris
%T The topological structure of planar closed spirals which support clans.
%J Semigroup forum
%D 1976
%P 115-118
%V 13
%I mathdoc
%U http://geodesic.mathdoc.fr/item/SF_1976__13_134202/
%F SF_1976__13_134202