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@article{MZ_1982__181_173255, author = {Dirk Ferus}, title = {The {Tightness} of {Extrinsic} {Symmetric} {Submanifolds.}}, journal = {Mathematische Zeitschrift}, pages = {563--566}, publisher = {mathdoc}, volume = {181}, year = {1982}, zbl = {0488.53041}, url = {http://geodesic.mathdoc.fr/item/MZ_1982__181_173255/} }
Dirk Ferus. The Tightness of Extrinsic Symmetric Submanifolds.. Mathematische Zeitschrift, Tome 181 (1982), pp. 563-566. http://geodesic.mathdoc.fr/item/MZ_1982__181_173255/