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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/} }
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/