%0 Journal Article
%A Petrić Milenko
%T On some operations on normal digraphs
%J Novi Sad Journal of Mathematics
%D 1988
%P 57-67
%V 18
%N 1
%I mathdoc
%U http://geodesic.mathdoc.fr/item/NSJOM_1988_18_1a_5/
%F NSJOM_1988_18_1a_5