@article{ZNSL_1982_107_a8,
     author = {V. V. Peller},
     title = {Rational approximation and smoothness of functions},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {150--159},
     publisher = {mathdoc},
     volume = {107},
     year = {1982},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1982_107_a8/}
}