@article{GDZPPN002311720, title = {Isometric Immersions of Constant Curvature Manifolds.}, journal = {Mathematische Annalen}, volume = {217}, year = {1975}, pages = {155-156}, zbl = {0295.53026}, url = {http://dml.mathdoc.fr/item/GDZPPN002311720} }
Ferus, Dirk. Isometric Immersions of Constant Curvature Manifolds.. Mathematische Annalen, Tome 217 (1975) pp. 155-156. http://gdmltest.u-ga.fr/item/GDZPPN002311720/