TY  - JOUR
AU  - M. Malec
AU  - Z. Skupień
TI  - On the maximal planar graphs and the four colour problem
JO  - Commentationes Mathematicae
PY  - 1969
SP  -  205
EP  - 209
VL  - 12
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.14708/cm.v12i2.5139/
DO  - 10.14708/cm.v12i2.5139
LA  - pl
ID  - 10_14708_cm_v12i2_5139
ER  -