%0 Journal Article %A Pondělíček, Bedřich %T A characterization of semilattices of left or right groups %J Czechoslovak Mathematical Journal %D 1972 %P 522-524 %V 22 %N 4 %I mathdoc %U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1972.101123/ %R 10.21136/CMJ.1972.101123 %G en %F 10_21136_CMJ_1972_101123