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• #### A characterization of isochronous centres in terms of symmetries ﻿

(2000)
Article
Accés obert
We present a description of isochronous centres of planar vector fields $X$ by means of their groups of symmetries. More precisely, given a normalizer $U$ of $X$ (i.e., $[X,U]=\mu X$, where $\mu$ is a scalar function), we ...