@article{GDZPPN002305429,
title = {On a Theorem of Fenchel-Borsuk-Willmore-Chern-Lashof.},
journal = {Mathematische Annalen},
volume = {193},
year = {1971},
pages = {19-26},
zbl = {0211.53602},
url = {http://dml.mathdoc.fr/item/GDZPPN002305429}
}
CHEN, Bang-Yen. On a Theorem of Fenchel-Borsuk-Willmore-Chern-Lashof.. Mathematische Annalen, Tome 193 (1971) pp. 19-26. http://gdmltest.u-ga.fr/item/GDZPPN002305429/