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@article{PORMA_1951__10_3_114527, author = {Samelson, Hans}, title = {A theorem on differentiable manifolds}, journal = {Portugaliae mathematica}, pages = {129--133}, publisher = {mathdoc}, volume = {10}, number = {3}, year = {1951}, mrnumber = {0044882}, zbl = {0054.07202}, language = {en}, url = {http://geodesic.mathdoc.fr/item/PORMA_1951__10_3_114527/} }
Samelson, Hans. A theorem on differentiable manifolds. Portugaliae mathematica, Tome 10 (1951) no. 3, pp. 129-133. http://geodesic.mathdoc.fr/item/PORMA_1951__10_3_114527/