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Published online by Cambridge University Press: 01 February 1998
Let $F_\lambda(z)= \lambda z + {\cal O}(z^2)$ be a one parameter holomorphicfamily of holomorphic maps defined in a neighborhood of $\lambda_0*\overline{\mbox{D}}$. Assume that $F_{\lambda_0}$ has a Siegel disc$\Delta_0$, then the orbit of a point in the interior of the Siegeldisc can be followed very closely by periodic orbits of nearby maps.The same technique is applied to Herman rings and Cremer points.