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@article{MS2_1962__11_165807, author = {Folke Eriksson}, title = {Planes of {Curvature} in {Riemannian} {Spaces.}}, journal = {Mathematica Scandinavica}, pages = {5--21}, publisher = {mathdoc}, volume = {11}, year = {1962}, zbl = {0121.38601}, url = {http://geodesic.mathdoc.fr/item/MS2_1962__11_165807/} }
Folke Eriksson. Planes of Curvature in Riemannian Spaces.. Mathematica Scandinavica, Tome 11 (1962), pp. 5-21. http://geodesic.mathdoc.fr/item/MS2_1962__11_165807/