%0 Journal Article %A Djoković, D. Ž. %T On a Class of Semigroups %J Canadian mathematical bulletin %D 1969 %P 213-215 %V 12 %N 2 %U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1969-024-8/ %R 10.4153/CMB-1969-024-8 %F 10_4153_CMB_1969_024_8