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@article{CMH_1951__25_139026, author = {Shiing-Shen Chern and E. Spanier}, title = {A {Theorem} on {Orientable} {Surfaces} in {Four-Dimensional} {Space.}}, journal = {Commentarii mathematici Helvetici}, pages = {205--209}, publisher = {mathdoc}, volume = {25}, year = {1951}, zbl = {0043.38403}, url = {http://geodesic.mathdoc.fr/item/CMH_1951__25_139026/} }
Shiing-Shen Chern; E. Spanier. A Theorem on Orientable Surfaces in Four-Dimensional Space.. Commentarii mathematici Helvetici, Tome 25 (1951), pp. 205-209. http://geodesic.mathdoc.fr/item/CMH_1951__25_139026/