TY  - JOUR
AU  - Andrzej Pelc
TI  - Solution of a problem of Ulam on countable sequences of sets
JO  - Fundamenta Mathematicae
PY  - 1981
SP  - 113
EP  - 118
VL  - 114
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-114-2-113-118/
DO  - 10.4064/fm-114-2-113-118
LA  - en
ID  - 10_4064_fm_114_2_113_118
ER  -