TY  - JOUR
AU  - R. Drabiński
AU  - E. Grzegorek
TI  - When $\aleph _1$ many sets are contained in a
 countably generated $\sigma $-field
JO  - Colloquium Mathematicum
PY  - 2009
SP  - 41
EP  - 45
VL  - 115
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/cm115-1-5/
DO  - 10.4064/cm115-1-5
LA  - en
ID  - 10_4064_cm115_1_5
ER  -