@article{IM2_1983_20_1_a3,
     author = {B. M. Levitan},
     title = {Approximation of infinite-zone potentials by finite-zone potentials},
     journal = {Izvestiya. Mathematics},
     pages = {55--87},
     year = {1983},
     volume = {20},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1983_20_1_a3/}
}