TY  - JOUR
AU  - Abbott, H. L.
TI  - On Property of Families of Sets
JO  - Canadian mathematical bulletin
PY  - 1975
SP  - 133
EP  - 135
VL  - 18
IS  - 1
UR  - http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-024-0/
DO  - 10.4153/CMB-1975-024-0
ID  - 10_4153_CMB_1975_024_0
ER  -