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@article{IVM_1963_3_a24, author = {Ya. L. Shapiro}, title = {Some systems of paths contained in a {Riemannian} space}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {166--172}, publisher = {mathdoc}, number = {3}, year = {1963}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1963_3_a24/} }
Ya. L. Shapiro. Some systems of paths contained in a Riemannian space. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 3 (1963), pp. 166-172. http://geodesic.mathdoc.fr/item/IVM_1963_3_a24/