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@article{MAN_1971__194_162182, author = {Bang-Yen CHEN}, title = {On a {Theorem} of {Fenchel-Borsuk-Willmore-Chern-Lashof.}}, journal = {Mathematische Annalen}, pages = {19--26}, publisher = {mathdoc}, volume = {194}, year = {1971}, zbl = {0211.53602}, url = {http://geodesic.mathdoc.fr/item/MAN_1971__194_162182/} }
Bang-Yen CHEN. On a Theorem of Fenchel-Borsuk-Willmore-Chern-Lashof.. Mathematische Annalen, Tome 194 (1971), pp. 19-26. http://geodesic.mathdoc.fr/item/MAN_1971__194_162182/