@article{IVM_1976_1_a10,
     author = {G. N. Timofeev},
     title = {Invariant criteria for special compositions in {Weyl} spaces},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {87--99},
     publisher = {mathdoc},
     number = {1},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1976_1_a10/}
}