@article{SM_2006_197_2_a5,
     author = {V. G. Ryabykh},
     title = {Approximation of non-analytic functions by analytic ones},
     journal = {Sbornik. Mathematics},
     pages = {225--233},
     publisher = {mathdoc},
     volume = {197},
     number = {2},
     year = {2006},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2006_197_2_a5/}
}