@article{IVM_1972_12_a10,
     author = {Ya. L. Shapiro},
     title = {The two-sheeted structure on a~reducible {Riemannian} manifold},
     journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika},
     pages = {102--110},
     publisher = {mathdoc},
     number = {12},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/IVM_1972_12_a10/}
}