@article{SM_1994_78_1_a14,
     author = {P. V. Paramonov},
     title = {$C^m$-approximations by harmonic polynomials on compact sets in~$\mathbb R^n$},
     journal = {Sbornik. Mathematics},
     pages = {231--251},
     publisher = {mathdoc},
     volume = {78},
     number = {1},
     year = {1994},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1994_78_1_a14/}
}