@article{SM_1989_62_2_a9,
     author = {A. F. Leont'ev},
     title = {Representation of functions by generalized exponential series},
     journal = {Sbornik. Mathematics},
     pages = {491--505},
     publisher = {mathdoc},
     volume = {62},
     number = {2},
     year = {1989},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/SM_1989_62_2_a9/}
}