%0 Journal Article %A R. A. Sharipov %T On a~problem associated with approximation by exponential functions %J Ufa mathematical journal %D 2015 %P 83-94 %V 7 %N 1 %I mathdoc %U http://geodesic.mathdoc.fr/item/UFA_2015_7_1_a7/ %G en %F UFA_2015_7_1_a7