Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1976_227_6_a4, author = {A. V. Ostrovsky}, title = {$k$-covering mappings}, journal = {Doklady Akademii Nauk}, pages = {1297--1300}, publisher = {mathdoc}, volume = {227}, number = {6}, year = {1976}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1976_227_6_a4/} }
A. V. Ostrovsky. $k$-covering mappings. Doklady Akademii Nauk, Tome 227 (1976) no. 6, pp. 1297-1300. http://geodesic.mathdoc.fr/item/DAN_1976_227_6_a4/