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@article{10_4064_fm_89_2_173_176, author = {H. Potoczny}, title = {Closure-preserving families of finite sets}, journal = {Fundamenta Mathematicae}, pages = {173--176}, publisher = {mathdoc}, volume = {89}, number = {2}, year = {1975}, doi = {10.4064/fm-89-2-173-176}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/fm-89-2-173-176/} }
H. Potoczny. Closure-preserving families of finite sets. Fundamenta Mathematicae, Tome 89 (1975) no. 2, pp. 173-176. doi : 10.4064/fm-89-2-173-176. http://geodesic.mathdoc.fr/articles/10.4064/fm-89-2-173-176/
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