@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/}
}