@article{IVM_1977_3_a5,
     author = {E. K. Leont'ev},
     title = {$r$-orthogonal compositions and their classification in {Weyl} and {Riemannian} spaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {43--52},
     publisher = {mathdoc},
     number = {3},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1977_3_a5/}
}