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@article{IVM_1973_1_a13, author = {Ya. L. Shapiro}, title = {$S$-reducible manifolds}, journal = {Izvesti\^a vys\v{s}ih u\v{c}ebnyh zavedenij. Matematika}, pages = {110--119}, publisher = {mathdoc}, number = {1}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/IVM_1973_1_a13/} }
Ya. L. Shapiro. $S$-reducible manifolds. Izvestiâ vysših učebnyh zavedenij. Matematika, no. 1 (1973), pp. 110-119. http://geodesic.mathdoc.fr/item/IVM_1973_1_a13/