TY  - JOUR
AU  - Sobczyk, Andrew
AU  - Jr., James O. Gettys
TI  - Extended Chromatic Polynomials
JO  - Canadian journal of mathematics
PY  - 1972
SP  - 492
EP  - 501
VL  - 24
IS  - 3
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1972-042-0/
DO  - 10.4153/CJM-1972-042-0
ID  - 10_4153_CJM_1972_042_0
ER  -