%0 Journal Article %A Wong, H. Ship Fah %T The Topological Degree of A-Proper Maps %J Canadian journal of mathematics %D 1971 %P 403-412 %V 23 %N 3 %U http://geodesic.mathdoc.fr/articles/10.4153/CJM-1971-042-5/ %R 10.4153/CJM-1971-042-5 %F 10_4153_CJM_1971_042_5