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@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/} }
B. M. Levitan. Theorem on the argument of an almost periodic function. Matematičeskie zametki, Tome 1 (1967) no. 1, pp. 35-44. http://geodesic.mathdoc.fr/item/MZM_1967_1_1_a4/