%0 Journal Article
%A Robert Fittler
%T Categories with Ultraproducts
%J Commentarii mathematici Helvetici
%D 1973
%P 100-115
%V 48
%I mathdoc
%U http://geodesic.mathdoc.fr/item/CMH_1973__48_139540/
%F CMH_1973__48_139540