MathSciNet bibliographic data MR2761768 37F10 Xiao, Yingqing; Qiu, Weiyuan The rational maps $F_\lambda(z)=z^m+\lambda/z^d$$F_\lambda(z)=z^m+\lambda/z^d$ have no Herman rings. Proc. Indian Acad. Sci. Math. Sci. 120 (2010), no. 4, 403–407. Article

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