TY  - JOUR
AU  - H. Potoczny
TI  - Closure-preserving families of finite sets
JO  - Fundamenta Mathematicae
PY  - 1975
SP  - 173
EP  - 176
VL  - 89
IS  - 2
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/articles/10.4064/fm-89-2-173-176/
DO  - 10.4064/fm-89-2-173-176
LA  - en
ID  - 10_4064_fm_89_2_173_176
ER  -