%0 Journal Article %A Trnková, Věra %T Products of topological spaces represent any semigroup (Preliminary communication) %J Commentationes Mathematicae Universitatis Carolinae %D 1975 %P 393-394 %V 16 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/CMUC_1975__16_2_a14/ %G en %F CMUC_1975__16_2_a14