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@article{MZ_1971__119_171500, author = {Grigorios Tsagas}, title = {Some {Properties} of the {Curvature} {Operator} of a {Riemannian} {Manifold.}}, journal = {Mathematische Zeitschrift}, pages = {283--286}, publisher = {mathdoc}, volume = {119}, year = {1971}, zbl = {0195.23503}, url = {http://geodesic.mathdoc.fr/item/MZ_1971__119_171500/} }
Grigorios Tsagas. Some Properties of the Curvature Operator of a Riemannian Manifold.. Mathematische Zeitschrift, Tome 119 (1971), pp. 283-286. http://geodesic.mathdoc.fr/item/MZ_1971__119_171500/