%0 Journal Article
%A A. 

 Popović
%A M. Ivanović
%T A truly 

 polymorphic number class hierarchy
%J Novi Sad Journal of Mathematics
%D 2000
%P 123-130
%V 30
%N 3
%I mathdoc
%U http://geodesic.mathdoc.fr/item/NSJOM_2000_30_3a_12/
%F NSJOM_2000_30_3a_12