%0 Journal Article
%A Sobczyk, Andrew
%A Jr., James O. Gettys
%T Extended Chromatic Polynomials
%J Canadian journal of mathematics
%D 1972
%P 492-501
%V 24
%N 3
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1972-042-0/
%R 10.4153/CJM-1972-042-0
%F 10_4153_CJM_1972_042_0