Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1984_275_6_a8, author = {R. S. Sadyrkhanov}, title = {A condition for a mapping to be a local homeomorphism}, journal = {Doklady Akademii Nauk}, pages = {1316--1320}, publisher = {mathdoc}, volume = {275}, number = {6}, year = {1984}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1984_275_6_a8/} }
R. S. Sadyrkhanov. A condition for a mapping to be a local homeomorphism. Doklady Akademii Nauk, Tome 275 (1984) no. 6, pp. 1316-1320. http://geodesic.mathdoc.fr/item/DAN_1984_275_6_a8/