@article{SM_1996_187_3_a3,
     author = {S. N. Kudryavtsev},
     title = {Approximation of a~partial differential operator by bounded operators on a~class of functions of finite smoothness},
     journal = {Sbornik. Mathematics},
     pages = {385--402},
     publisher = {mathdoc},
     volume = {187},
     number = {3},
     year = {1996},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1996_187_3_a3/}
}