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@article{10_4064_cm_7_1_23_25, author = {S. Mr\'owka}, title = {On the potency of subsets of {\ensuremath{\beta}N}}, journal = {Colloquium Mathematicum}, pages = {23--25}, publisher = {mathdoc}, volume = {7}, number = {1}, year = {1959}, doi = {10.4064/cm-7-1-23-25}, language = {en}, url = {http://geodesic.mathdoc.fr/articles/10.4064/cm-7-1-23-25/} }
S. Mrówka. On the potency of subsets of βN. Colloquium Mathematicum, Tome 7 (1959) no. 1, pp. 23-25. doi : 10.4064/cm-7-1-23-25. http://geodesic.mathdoc.fr/articles/10.4064/cm-7-1-23-25/
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