@article{bwmeta1.element.bwnjournal-article-fmv89i1p16bwm,
author = {H. Potoczny},
title = {Closure-preserving families of finite sets},
journal = {Fundamenta Mathematicae},
volume = {89},
year = {1975},
pages = {173-176},
zbl = {0311.54022},
language = {en},
url = {http://dml.mathdoc.fr/item/bwmeta1.element.bwnjournal-article-fmv89i1p16bwm}
}
Potoczny, H. Closure-preserving families of finite sets. Fundamenta Mathematicae, Tome 89 (1975) pp. 173-176. http://gdmltest.u-ga.fr/item/bwmeta1.element.bwnjournal-article-fmv89i1p16bwm/