Geodesic
On the problem of distinguishing between a center and a focus
Doklady Akademii Nauk, Tome 203 (1972) no. 5, pp. 1008-1010.

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     author = {S. D. Shchuko},
     title = {On the problem of distinguishing between a center and a focus},
     journal = {Doklady Akademii Nauk},
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     publisher = {mathdoc},
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     number = {5},
     year = {1972},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1972_203_5_a8/}
}
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S. D. Shchuko. On the problem of distinguishing between a center and a focus. Doklady Akademii Nauk, Tome 203 (1972) no. 5, pp. 1008-1010. http://geodesic.mathdoc.fr/item/DAN_1972_203_5_a8/