@article{UFA_2015_7_1_a7,
     author = {R. A. Sharipov},
     title = {On a~problem associated with approximation by exponential functions},
     journal = {Ufa mathematical journal},
     pages = {83--94},
     publisher = {mathdoc},
     volume = {7},
     number = {1},
     year = {2015},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/UFA_2015_7_1_a7/}
}