%0 Journal Article %A S. F. Prokoptsev %T Estimates of linear combinations of near-exponential functions with positive and negative exponents %J Matematičeskie zametki %D 1976 %P 227-240 %V 20 %N 2 %I mathdoc %U http://geodesic.mathdoc.fr/item/MZM_1976_20_2_a7/ %G ru %F MZM_1976_20_2_a7