Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1972_207_5_a5, author = {Yu. Lisitsa}, title = {The extension of mappings and a factorization theorem}, journal = {Doklady Akademii Nauk}, pages = {1042--1043}, publisher = {mathdoc}, volume = {207}, number = {5}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1972_207_5_a5/} }
Yu. Lisitsa. The extension of mappings and a factorization theorem. Doklady Akademii Nauk, Tome 207 (1972) no. 5, pp. 1042-1043. http://geodesic.mathdoc.fr/item/DAN_1972_207_5_a5/