@article{GDZPPN002385651,
title = {A theorem on surfaces with a closed boundary.},
journal = {Mathematische Zeitschrift},
volume = {64},
year = {1956},
pages = {41-46},
zbl = {0070.16801},
url = {http://dml.mathdoc.fr/item/GDZPPN002385651}
}
Hsiung, Chuan-Chih. A theorem on surfaces with a closed boundary.. Mathematische Zeitschrift, Tome 64 (1956) pp. 41-46. http://gdmltest.u-ga.fr/item/GDZPPN002385651/