%0 Journal Article %A I. I. Sharapudinov %T Approximation of functions in variable-exponent Lebesgue and Sobolev spaces by de la Vall\'ee-Poussin means %J Sbornik. Mathematics %D 2016 %P 1010-1036 %V 207 %N 7 %I mathdoc %U http://geodesic.mathdoc.fr/item/SM_2016_207_7_a5/ %G en %F SM_2016_207_7_a5