@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/}
}