TY  - JOUR
AU  - Hedetniemi, Stephen
TI  - On Partitioning Planar Graphs
JO  - Canadian mathematical bulletin
PY  - 1968
SP  - 203
EP  - 211
VL  - 11
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1968-023-5/
DO  - 10.4153/CMB-1968-023-5
ID  - 10_4153_CMB_1968_023_5
ER  -