%0 Journal Article
%A Ulrich Höhle
%T Covariant presheaves and subalgebras
%J Theory and applications of categories
%D 2011
%P 342-367
%V 25
%I mathdoc
%U http://geodesic.mathdoc.fr/item/TAC_2011_25_a12/
%G en
%F TAC_2011_25_a12