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@article{DAN_1973_211_5_a3, author = {V. M. Bykov}, title = {On closed coverings of manifolds and linking of cycles}, journal = {Doklady Akademii Nauk}, pages = {1027--1030}, publisher = {mathdoc}, volume = {211}, number = {5}, year = {1973}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1973_211_5_a3/} }
V. M. Bykov. On closed coverings of manifolds and linking of cycles. Doklady Akademii Nauk, Tome 211 (1973) no. 5, pp. 1027-1030. http://geodesic.mathdoc.fr/item/DAN_1973_211_5_a3/