@article{SM_2005_196_5_a0,
     author = {V. N. Konovalov},
     title = {Impact of the shape of functions on the orders of piecewise polynomial and rational approximation},
     journal = {Sbornik. Mathematics},
     pages = {623--648},
     publisher = {mathdoc},
     volume = {196},
     number = {5},
     year = {2005},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_2005_196_5_a0/}
}