@article{SM_1988_61_2_a5,
     author = {N. N. Tarkhanov},
     title = {Uniform approximation by solutions of elliptic systems},
     journal = {Sbornik. Mathematics},
     pages = {351--377},
     publisher = {mathdoc},
     volume = {61},
     number = {2},
     year = {1988},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1988_61_2_a5/}
}