@article{RM_2012_67_6_a2,
     author = {M. Ya. Mazalov and P. V. Paramonov and K. Yu. Fedorovskiy},
     title = {Conditions for $C^m$-approximability of functions by solutions of elliptic equations},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {1023--1068},
     publisher = {mathdoc},
     volume = {67},
     number = {6},
     year = {2012},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/RM_2012_67_6_a2/}
}