@article{MZM_1976_20_2_a7,
     author = {S. F. Prokoptsev},
     title = {Estimates of linear combinations of near-exponential functions with positive and negative exponents},
     journal = {Matemati\v{c}eskie zametki},
     pages = {227--240},
     publisher = {mathdoc},
     volume = {20},
     number = {2},
     year = {1976},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1976_20_2_a7/}
}