TY  - JOUR
AU  - Erdős, P.
TI  - On A Combinatorial Problem III
JO  - Canadian mathematical bulletin
PY  - 1969
SP  - 413
EP  - 416
VL  - 12
IS  - 4
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-051-5/
DO  - 10.4153/CMB-1969-051-5
ID  - 10_4153_CMB_1969_051_5
ER  -