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@article{MZ_1974__140_172134, author = {Dirk Ferus}, title = {Immersions with {Parallel} {Second} {Fundamental} {Form.}}, journal = {Mathematische Zeitschrift}, pages = {87--94}, publisher = {mathdoc}, volume = {140}, year = {1974}, zbl = {0279.53048}, url = {http://geodesic.mathdoc.fr/item/MZ_1974__140_172134/} }
Dirk Ferus. Immersions with Parallel Second Fundamental Form.. Mathematische Zeitschrift, Tome 140 (1974), pp. 87-94. http://geodesic.mathdoc.fr/item/MZ_1974__140_172134/