@article{SM_1999_190_2_a5,
     author = {P. V. Paramonov and K. Yu. Fedorovskiy},
     title = {Uniform and $C^1$-approximability of functions on compact subsets of $\mathbb R^2$ by solutions of second-order elliptic equations},
     journal = {Sbornik. Mathematics},
     pages = {285--307},
     publisher = {mathdoc},
     volume = {190},
     number = {2},
     year = {1999},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1999_190_2_a5/}
}