%0 Journal Article
%A Susan Niefield
%T Span, cospan, and other double categories
%J Theory and applications of categories
%D 2012
%P 729-742
%V 26
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TAC_2012_26_a25/
%G en
%F TAC_2012_26_a25