MathSciNet bibliographic data MR2642467 (2011j:37079) 37F10 (30D05 37F50) Garijo, Antonio; Marotta, Sebastian M. Singular perturbations of \$z\sp n\$$z\sp n$ with a pole on the unit circle. J. Difference Equ. Appl. 16 (2010), no. 5-6, 573–595. Article

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