TY  - JOUR
AU  - Ed Dubinsky
AU  - W. Robinson
TI  - A characterization of ω by block extensions
JO  - Studia Mathematica
PY  - 1973
SP  - 153
EP  - 159
VL  - 47
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/sm-47-2-153-159/
DO  - 10.4064/sm-47-2-153-159
LA  - en
ID  - 10_4064_sm_47_2_153_159
ER  -