@article{SM_2004_195_9_a2,
     author = {I. F. Krasichkov-Ternovskii},
     title = {Approximation theorem for a~homogeneous
},
     journal = {Sbornik. Mathematics},
     pages = {1271--1289},
     publisher = {mathdoc},
     volume = {195},
     number = {9},
     year = {2004},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2004_195_9_a2/}
}