TY  - JOUR
AU  - Sobczyk, Andrew
TI  - Graph-Colouring and Combinatorial Numbers
JO  - Canadian journal of mathematics
PY  - 1968
SP  - 520
EP  - 534
VL  - 20
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CJM-1968-054-x/
DO  - 10.4153/CJM-1968-054-x
ID  - 10_4153_CJM_1968_054_x
ER  -