Geodesic
A generalization of two theorems of C. L. Siegel to the nonautonomous case
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 4 
L. D. Pustyl'nikov. A generalization of two theorems of C. L. Siegel to the nonautonomous case. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 26 (1971) no. 4. http://geodesic.mathdoc.fr/item/RM_1971_26_4_a16/
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     title = {A~generalization of two theorems of {C.} {L.~Siegel} to the nonautonomous case},
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Voir la notice de l'article provenant de la source Math-Net.Ru

[1] K. L. Zigel, Lektsii po nebesnoi mekhanike, IL, M., 1959

[2] C. L. Siegel, “Iteration of Analytic Functions”, Ann. of Math., 43 (1942), 607–612 | DOI | MR | Zbl

[3] K. L. Zigel, “O normalnoi forme analiticheskikh differentsialnykh uravnenii v okrestnosti polozheniya ravnovesiya”, Matematika. Sb. perev., 5:2 (1961), 119–128