@article{MZM_1967_1_1_a4,
     author = {B. M. Levitan},
     title = {Theorem on the argument of an almost periodic function},
     journal = {Matemati\v{c}eskie zametki},
     pages = {35--44},
     publisher = {mathdoc},
     volume = {1},
     number = {1},
     year = {1967},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1967_1_1_a4/}
}