@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/}
}