%0 Journal Article
%A S. MacLane
%T An algebra of additive relations
%J Matematika
%D 1963
%P 3-12
%V 7
%N 6
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MAT_1963_7_6_a0/
%G ru
%F MAT_1963_7_6_a0