TY  - JOUR
AU  - Erdös, P.
TI  - On a Problem of Groübaum
JO  - Canadian mathematical bulletin
PY  - 1972
SP  - 23
EP  - 25
VL  - 15
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1972-005-4/
DO  - 10.4153/CMB-1972-005-4
ID  - 10_4153_CMB_1972_005_4
ER  -