%0 Journal Article
%A Bogdanović 

 Stojan
%A Crvenković Siniša
%T On some classes of 

 semigroups
%J Novi Sad Journal of Mathematics
%D 1978
%P 69-77
%V 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/NSJOM_1978_8_Nonea_10/
%F NSJOM_1978_8_Nonea_10