TY  - JOUR
AU  - Schonheim, J.
TI  - On A Problem of Purdy Related to Sperner Systems
JO  - Canadian mathematical bulletin
PY  - 1974
SP  - 135
EP  - 136
VL  - 17
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1974-029-1/
DO  - 10.4153/CMB-1974-029-1
ID  - 10_4153_CMB_1974_029_1
ER  -