Geodesic
The problem of center in the case of a complex stationary point that is separable into simple saddle points
Differencialʹnye uravneniâ, Tome 14 (1978) no. 10, pp. 1814-1823.

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     author = {A. V. Skitovich},
     title = {The problem of center in the case of a complex stationary point that is separable into simple saddle points},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1814--1823},
     publisher = {mathdoc},
     volume = {14},
     number = {10},
     year = {1978},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1978_14_10_a10/}
}
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A. V. Skitovich. The problem of center in the case of a complex stationary point that is separable into simple saddle points. Differencialʹnye uravneniâ, Tome 14 (1978) no. 10, pp. 1814-1823. http://geodesic.mathdoc.fr/item/DE_1978_14_10_a10/