Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1990_311_4_a2, author = {N. Yu. Kapustin}, title = {Solvability in the class $L_2$ of the characteristic problem}, journal = {Doklady Akademii Nauk}, pages = {784--788}, publisher = {mathdoc}, volume = {311}, number = {4}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_4_a2/} }
N. Yu. Kapustin. Solvability in the class $L_2$ of the characteristic problem. Doklady Akademii Nauk, Tome 311 (1990) no. 4, pp. 784-788. http://geodesic.mathdoc.fr/item/DAN_1990_311_4_a2/