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@article{DAN_1990_315_6_a5, author = {N. N. Tarkhanov}, title = {Approximation in {Sobolev} spaces by solutions of elliptic systems}, journal = {Doklady Akademii Nauk}, pages = {1308--1313}, publisher = {mathdoc}, volume = {315}, number = {6}, year = {1990}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1990_315_6_a5/} }
N. N. Tarkhanov. Approximation in Sobolev spaces by solutions of elliptic systems. Doklady Akademii Nauk, Tome 315 (1990) no. 6, pp. 1308-1313. http://geodesic.mathdoc.fr/item/DAN_1990_315_6_a5/