%0 Journal Article
%A Porter, Jack R.
%T Extension Function and Subcategories of Haus
%J Canadian mathematical bulletin
%D 1975
%P 587-590
%V 18
%N 4
%U http://geodesic.mathdoc.fr/articles/10.4153/CMB-1975-103-x/
%R 10.4153/CMB-1975-103-x
%F 10_4153_CMB_1975_103_x