@article{MZM_2005_77_4_a5,
     author = {S. N. Kudryavtsev},
     title = {Widths of classes of finitely smooth functions in {Sobolev} spaces},
     journal = {Matemati\v{c}eskie zametki},
     pages = {535--539},
     publisher = {mathdoc},
     volume = {77},
     number = {4},
     year = {2005},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2005_77_4_a5/}
}