%0 Journal Article
%A M. Demlov\'{a}
%A V. Koubek
%T Weaker 

 universalities in semigroup varieties
%J Novi Sad Journal of Mathematics
%D 2004
%P 37-86
%V 34
%N 2
%I mathdoc
%U http://geodesic.mathdoc.fr/item/NSJOM_2004_34_2a_4/
%F NSJOM_2004_34_2a_4