@article{DAN_1980_253_5_a3,
     author = {B. M. Levitan},
     title = {Almost periodicity of infinite-zone potentials},
     journal = {Doklady Akademii Nauk},
     pages = {1044--1046},
     year = {1980},
     volume = {253},
     number = {5},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1980_253_5_a3/}
}