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@article{MS2_1991__69_1_167166, author = {Walter Seaman}, title = {Orthogonally pinched curvature tensors and applications.}, journal = {Mathematica Scandinavica}, pages = {5--14}, publisher = {mathdoc}, volume = {69}, number = {1}, year = {1991}, zbl = {0759.53030}, url = {http://geodesic.mathdoc.fr/item/MS2_1991__69_1_167166/} }
Walter Seaman. Orthogonally pinched curvature tensors and applications.. Mathematica Scandinavica, Tome 69 (1991) no. 1, pp. 5-14. http://geodesic.mathdoc.fr/item/MS2_1991__69_1_167166/