%0 Journal Article %A R. Fox %T On a problem of S. Ulam concerning Cartesian products %J Fundamenta Mathematicae %D 1947 %P 278 %V 34 %N 1 %I mathdoc %U https://geodesic-test.mathdoc.fr/item/FUNDAM_1947__34_1_213133/ %G en %F FUNDAM_1947__34_1_213133