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Pöschel, J. (1990) Small Divisors with Spatial Structure in Infinite-Dimensional Hamiltonian Systems. Communications in Mathematical Physics, 127, 351-393.
https://doi.org/10.1007/BF02096763

has been cited by the following article:

• TITLE: Reducibility for a Class of Two-Dimensional almost Periodic System with Small Perturbation

  AUTHORS: Fanhui Meng, Wenhua Qiu

  KEYWORDS: Almost Periodic System, KAM Iterative Method, Reducibility

  JOURNAL NAME: Advances in Pure Mathematics, Vol.11 No.12, December 21, 2021

  ABSTRACT: This paper focuses on the reducibility of two-dimensional almost periodic system with small perturbation. We use the KAM iterative method to get the reducibility by an almost periodic transformation. The system has been reduced to a simple form. So we have dealt with the small perturbation problem of the almost periodic system.