%0 Journal Article
%A R. Dacić
%T Group and hypergroup operations induced by multivalued functions
%J Matematički vesnik
%D 1969
%P 463 
%V 21
%N 4
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MV_1969_21_4_a19/
%F MV_1969_21_4_a19