Reducible Riemannian spaces and two-sheeted structures on them
Doklady Akademii Nauk, Tome 206 (1972) no. 4, pp. 831-833.

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@article{DAN_1972_206_4_a14,
     author = {Ya. L. Shapiro},
     title = {Reducible {Riemannian} spaces and two-sheeted structures on them},
     journal = {Doklady Akademii Nauk},
     pages = {831--833},
     publisher = {mathdoc},
     volume = {206},
     number = {4},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_206_4_a14/}
}
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Ya. L. Shapiro. Reducible Riemannian spaces and two-sheeted structures on them. Doklady Akademii Nauk, Tome 206 (1972) no. 4, pp. 831-833. http://geodesic.mathdoc.fr/item/DAN_1972_206_4_a14/