TY  - JOUR
AU  - Krzysztof Mazur
TI  - $F_σ$-ideals and $ω_1 ω^*_1$-gaps in the Boolean algebras Ρ(ω)/I.
JO  - Fundamenta Mathematicae
PY  - 1991
SP  - 103
EP  - 111
VL  - 138
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-138-2-103-111/
DO  - 10.4064/fm-138-2-103-111
LA  - en
ID  - 10_4064_fm_138_2_103_111
ER  -