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@article{CMH_1984__59_139978, author = {John K. Beem and Philipp E. Parker}, title = {Values of pseudoriemannian sectional cuvature.}, journal = {Commentarii mathematici Helvetici}, pages = {319--332}, publisher = {mathdoc}, volume = {59}, year = {1984}, zbl = {0573.53014}, url = {http://geodesic.mathdoc.fr/item/CMH_1984__59_139978/} }
John K. Beem; Philipp E. Parker. Values of pseudoriemannian sectional cuvature.. Commentarii mathematici Helvetici, Tome 59 (1984), pp. 319-332. http://geodesic.mathdoc.fr/item/CMH_1984__59_139978/