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@article{DAN_1958_122_4_a3, author = {S. L. Sobolev}, title = {On mixed problems for partial differential equations with two independent variables}, journal = {Doklady Akademii Nauk}, pages = {555--558}, publisher = {mathdoc}, volume = {122}, number = {4}, year = {1958}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1958_122_4_a3/} }
S. L. Sobolev. On mixed problems for partial differential equations with two independent variables. Doklady Akademii Nauk, Tome 122 (1958) no. 4, pp. 555-558. http://geodesic.mathdoc.fr/item/DAN_1958_122_4_a3/