Geodesic
Proof of Levin's Half-Period Theorem
Differencialʹnye uravneniâ, Tome 41 (2005) no. 8, pp. 1125-1127 
Yu. S. Kolesov. Proof of Levin's Half-Period Theorem. Differencialʹnye uravneniâ, Tome 41 (2005) no. 8, pp. 1125-1127. http://geodesic.mathdoc.fr/item/DE_2005_41_8_a14/
@article{DE_2005_41_8_a14,
     author = {Yu. S. Kolesov},
     title = {Proof of {Levin's} {Half-Period} {Theorem}},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1125--1127},
     year = {2005},
     volume = {41},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2005_41_8_a14/}
}
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