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@article{IVM_1977_4_a8, author = {E. K. Leont'ev}, title = {Special $R$-orthogonal compositions in {Riemannian} spaces}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {69--82}, publisher = {mathdoc}, number = {4}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1977_4_a8/} }
E. K. Leont'ev. Special $R$-orthogonal compositions in Riemannian spaces. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 4 (1977), pp. 69-82. http://geodesic.mathdoc.fr/item/IVM_1977_4_a8/