Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DE_1972_8_6_a24, author = {V. V. Nikonenko}, title = {The existence and uniqueness of $O$-curves in normal domains}, journal = {Differencialʹnye uravneni\^a}, pages = {1126--1129}, publisher = {mathdoc}, volume = {8}, number = {6}, year = {1972}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DE_1972_8_6_a24/} }
V. V. Nikonenko. The existence and uniqueness of $O$-curves in normal domains. Differencialʹnye uravneniâ, Tome 8 (1972) no. 6, pp. 1126-1129. http://geodesic.mathdoc.fr/item/DE_1972_8_6_a24/