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I wish to thank R. Nagel for his guidance and suggestions in the preparation of this paper. Also, I would like to thank G. Greiner and F. Räbiger for many interesting and helpful discussions.
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Rau, R.T. On the peripheral spectrum of monic operator polynomials with positive coefficients. Integr equ oper theory 15, 479–495 (1992). https://doi.org/10.1007/BF01200331
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DOI: https://doi.org/10.1007/BF01200331