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@article{DAN_1990_311_1_a7, author = {A. P. Soldatov}, title = {A general boundary value problem of $(k-1)$st order for elliptic}, journal = {Doklady Akademii Nauk}, pages = {39--43}, publisher = {mathdoc}, volume = {311}, number = {1}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1990_311_1_a7/} }
A. P. Soldatov. A general boundary value problem of $(k-1)$st order for elliptic. Doklady Akademii Nauk, Tome 311 (1990) no. 1, pp. 39-43. http://geodesic.mathdoc.fr/item/DAN_1990_311_1_a7/