@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/}
}