@article{FPM_2013_18_5_a6,
     author = {A. S. Kochurov},
     title = {Direct and inverse theorems on approximation by piecewise polynomial functions},
     journal = {Fundamentalʹna\^a i prikladna\^a matematika},
     pages = {129--144},
     publisher = {mathdoc},
     volume = {18},
     number = {5},
     year = {2013},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FPM_2013_18_5_a6/}
}