%0 Journal Article
%A Ušan Janez
%A Stojaković Zoran
%T Orthogonal systems 

 of partial operations
%J Novi Sad Journal of Mathematics
%D 1978
%P 47-51
%V 8
%I mathdoc
%U http://geodesic.mathdoc.fr/item/NSJOM_1978_8_Nonea_7/
%F NSJOM_1978_8_Nonea_7