Geodesic
On some questions of the existence of the center
Differencialʹnye uravneniâ, Tome 4 (1968) no. 11, pp. 1931-1938 
K. S. Sibirskii. On some questions of the existence of the center. Differencialʹnye uravneniâ, Tome 4 (1968) no. 11, pp. 1931-1938. http://geodesic.mathdoc.fr/item/DE_1968_4_11_a0/
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     author = {K. S. Sibirskii},
     title = {On some questions of the existence of the center},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1931--1938},
     year = {1968},
     volume = {4},
     number = {11},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_1968_4_11_a0/}
}
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