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@article{DAN_1977_236_6_a6, author = {R. S. Saks}, title = {Boundary value problems for weakly elliptic systems of differential equations}, journal = {Doklady Akademii Nauk}, pages = {1311--1314}, publisher = {mathdoc}, volume = {236}, number = {6}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1977_236_6_a6/} }
R. S. Saks. Boundary value problems for weakly elliptic systems of differential equations. Doklady Akademii Nauk, Tome 236 (1977) no. 6, pp. 1311-1314. http://geodesic.mathdoc.fr/item/DAN_1977_236_6_a6/