@article{GDZPPN002361124, title = {Orthogonally pinched curvature tensors and applications.}, journal = {Mathematica Scandinavica}, volume = {69}, year = {1991}, pages = {5-14}, zbl = {0759.53030}, url = {http://dml.mathdoc.fr/item/GDZPPN002361124} }
Seaman, Walter. Orthogonally pinched curvature tensors and applications.. Mathematica Scandinavica, Tome 69 (1991) pp. 5-14. http://gdmltest.u-ga.fr/item/GDZPPN002361124/