%0 Journal Article
%A Lai, C. K.
%A Shum, Kar-Ping
%T Characterizations of dual semigroups
%J Czechoslovak Mathematical Journal
%D 1989
%P 578-584
%V 39
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1989.102330/
%R 10.21136/CMJ.1989.102330
%G en
%F 10_21136_CMJ_1989_102330