%0 Journal Article
%A Chuan-Chih Hsiung
%T A theorem on surfaces with a closed boundary.
%J Mathematische Zeitschrift
%D 1956
%P 41-46
%V 64
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MZ_1956__64_169552/
%F MZ_1956__64_169552