@article{SM_1998_189_3_a5,
     author = {A. M. Sedletskii},
     title = {Approximation properties of exponential  systems on the real line and the half-line},
     journal = {Sbornik. Mathematics},
     pages = {443--460},
     publisher = {mathdoc},
     volume = {189},
     number = {3},
     year = {1998},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1998_189_3_a5/}
}