Voir la notice de l'article provenant de la source Math-Net.Ru
@article{DAN_1970_192_3_a8, author = {Ya. A. Roitberg and Z. G. Sheftel}, title = {A certain class of general nonlocal elliptic problems}, journal = {Doklady Akademii Nauk}, pages = {511--513}, publisher = {mathdoc}, volume = {192}, number = {3}, year = {1970}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1970_192_3_a8/} }
Ya. A. Roitberg; Z. G. Sheftel. A certain class of general nonlocal elliptic problems. Doklady Akademii Nauk, Tome 192 (1970) no. 3, pp. 511-513. http://geodesic.mathdoc.fr/item/DAN_1970_192_3_a8/