@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/}
}