@article{CMFD_2013_50_a0,
     author = {I. P. Irodova},
     title = {Piecewise polynomial approximation methods in the theory of {Nikol'ski\u{i}{\textendash}Besov} spaces},
     journal = {Contemporary Mathematics. Fundamental Directions},
     pages = {3--159},
     year = {2013},
     volume = {50},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/CMFD_2013_50_a0/}
}