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@article{PORMA_1950__9_3_114686, author = {Fodor, G. and Ketskem\'ety, I.}, title = {Some theorems on the theory of aggregates}, journal = {Portugaliae mathematica}, pages = {145--147}, publisher = {mathdoc}, volume = {9}, number = {3}, year = {1950}, mrnumber = {0041189}, zbl = {0038.19702}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1950__9_3_114686/} }
Fodor, G.; Ketskeméty, I. Some theorems on the theory of aggregates. Portugaliae mathematica, Tome 9 (1950) no. 3, pp. 145-147. http://geodesic.mathdoc.fr/item/PORMA_1950__9_3_114686/