%0 Journal Article
%A Button, Robert Warren
%T A Non-Standard Characterization of Perfect Mappings
%J Canadian journal of mathematics
%D 1976
%P 1277-1279
%V 28
%N 6
%U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1976-126-2/
%R 10.4153/CJM-1976-126-2
%F 10_4153_CJM_1976_126_2