Geodesic
Periodic solutions of first-order elliptic systems
Differencialʹnye uravneniâ, Tome 17 (1981) no. 8, pp. 1468-1477 
D. Safarov. Periodic solutions of first-order elliptic systems. Differencialʹnye uravneniâ, Tome 17 (1981) no. 8, pp. 1468-1477. http://geodesic.mathdoc.fr/item/DE_1981_17_8_a10/
@article{DE_1981_17_8_a10,
     author = {D. Safarov},
     title = {Periodic solutions of first-order elliptic systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1468--1477},
     year = {1981},
     volume = {17},
     number = {8},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1981_17_8_a10/}
}
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