Geodesic
Necessity of Gomory's conditions for the existence of periodic solutions of two-dimensional quasihomogeneous systems
Differencialʹnye uravneniâ, Tome 21 (1985) no. 2, pp. 191-198 
O. A. Ivanov. Necessity of Gomory's conditions for the existence of periodic solutions of two-dimensional quasihomogeneous systems. Differencialʹnye uravneniâ, Tome 21 (1985) no. 2, pp. 191-198. http://geodesic.mathdoc.fr/item/DE_1985_21_2_a1/
@article{DE_1985_21_2_a1,
     author = {O. A. Ivanov},
     title = {Necessity of {Gomory's} conditions for the existence of periodic solutions of two-dimensional quasihomogeneous systems},
     journal = {Differencialʹnye uravneni\^a},
     pages = {191--198},
     year = {1985},
     volume = {21},
     number = {2},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1985_21_2_a1/}
}
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