%0 Journal Article
%A J. Ušan
%T On 

 congruence classes of n-groups
%J Novi Sad Journal of Mathematics
%D 1998
%P 75-89
%V 28
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/NSJOM_1998_28_1a_6/
%F NSJOM_1998_28_1a_6