%0 Journal Article %A P. Mostert %T Comments on some Wallace's problems on topological semigroups %J Colloquium Mathematicum %D 1963 %P 221-225 %V 10 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.4064/cm-10-2-221-225/ %R 10.4064/cm-10-2-221-225 %G en %F 10_4064_cm_10_2_221_225