@article{GDZPPN002427168, title = {The Tightness of Extrinsic Symmetric Submanifolds.}, journal = {Mathematische Zeitschrift}, volume = {180}, year = {1982}, pages = {563-566}, zbl = {0488.53041}, url = {http://dml.mathdoc.fr/item/GDZPPN002427168} }
Ferus, Dirk. The Tightness of Extrinsic Symmetric Submanifolds.. Mathematische Zeitschrift, Tome 180 (1982) pp. 563-566. http://gdmltest.u-ga.fr/item/GDZPPN002427168/