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@article{CMH_1952__26_139042, author = {Yung-Chow Wong}, title = {A {New} {Curvature} {Theory} for {Surfaces} in a {Euclidean} {4-Space.}}, journal = {Commentarii mathematici Helvetici}, pages = {152--170}, publisher = {mathdoc}, volume = {26}, year = {1952}, zbl = {0048.15102}, url = {http://geodesic.mathdoc.fr/item/CMH_1952__26_139042/} }
Yung-Chow Wong. A New Curvature Theory for Surfaces in a Euclidean 4-Space.. Commentarii mathematici Helvetici, Tome 26 (1952), pp. 152-170. http://geodesic.mathdoc.fr/item/CMH_1952__26_139042/