TY  - JOUR
AU  - P. Erdös
TI  - On an extremal problem in graph theory
JO  - Colloquium Mathematicum
PY  - 1964
SP  - 251
EP  - 254
VL  - 13
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm-13-2-251-254/
DO  - 10.4064/cm-13-2-251-254
LA  - en
ID  - 10_4064_cm_13_2_251_254
ER  -