TY  - JOUR
AU  - Jussi Ketonen
TI  - Some combinatorial properties of ultrafilters
JO  - Fundamenta Mathematicae
PY  - 1980
SP  - 225
EP  - 235
VL  - 107
IS  - 3
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-107-3-225-235/
DO  - 10.4064/fm-107-3-225-235
LA  - en
ID  - 10_4064_fm_107_3_225_235
ER  -