@article{GDZPPN002308215, title = {On the Gauss-Kronecker Curvature Tensors.}, journal = {Mathematische Annalen}, volume = {201}, year = {1973}, pages = {335-343}, zbl = {0241.53026}, url = {http://dml.mathdoc.fr/item/GDZPPN002308215} }
Kowalski, Oldrich. On the Gauss-Kronecker Curvature Tensors.. Mathematische Annalen, Tome 201 (1973) pp. 335-343. http://gdmltest.u-ga.fr/item/GDZPPN002308215/