Geodesic
The stability of the rotation number of a doubly periodic differential equation
Differencialʹnye uravneniâ, Tome 11 (1975) no. 11, pp. 1949-1955.

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@article{DE_1975_11_11_a4,
     author = {E. K. Ershov},
     title = {The stability of the rotation number of a doubly periodic differential equation},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1949--1955},
     publisher = {mathdoc},
     volume = {11},
     number = {11},
     year = {1975},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1975_11_11_a4/}
}
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E. K. Ershov. The stability of the rotation number of a doubly periodic differential equation. Differencialʹnye uravneniâ, Tome 11 (1975) no. 11, pp. 1949-1955. http://geodesic.mathdoc.fr/item/DE_1975_11_11_a4/