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@article{IVM_1978_4_a12, author = {N. R. Kamyshanskii}, title = {Analytic {pseudo-Riemannian} spaces of dimension $n\geq 3$ with polars}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {109--112}, publisher = {mathdoc}, number = {4}, year = {1978}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1978_4_a12/} }
N. R. Kamyshanskii. Analytic pseudo-Riemannian spaces of dimension $n\geq 3$ with polars. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1978), pp. 109-112. http://geodesic.mathdoc.fr/item/IVM_1978_4_a12/