TY  - JOUR
AU  - Chuan-Chih Hsiung
TI  - A theorem on surfaces with a closed boundary.
JO  - Mathematische Zeitschrift
PY  - 1956
SP  - 41
EP  - 46
VL  - 64
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/MZ_1956__64_169552/
ID  - MZ_1956__64_169552
ER  -