@article{IM2_2004_68_1_a3,
     author = {S. N. Kudryavtsev},
     title = {Approximation of the derivatives of finitely smooth functions belonging to non-isotropic classes},
     journal = {Izvestiya. Mathematics },
     pages = {77--123},
     publisher = {mathdoc},
     volume = {68},
     number = {1},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_2004_68_1_a3/}
}