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@article{IVM_1997_9_a10, author = {E. I. Yakovlev}, title = {Sectional curvatures of manifolds of the {Kaluza--Klein} type}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {75--82}, publisher = {mathdoc}, number = {9}, year = {1997}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1997_9_a10/} }
E. I. Yakovlev. Sectional curvatures of manifolds of the Kaluza--Klein type. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 9 (1997), pp. 75-82. http://geodesic.mathdoc.fr/item/IVM_1997_9_a10/