%0 Journal Article %A Schwarz, Štefan %T On the structure of dual semigroups %J Czechoslovak Mathematical Journal %D 1971 %P 461-483 %V 21 %N 3 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1971.101048/ %R 10.21136/CMJ.1971.101048 %G en %F 10_21136_CMJ_1971_101048