【摘 要】
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Let P(z) be a polynomial of degree n having no zeros in |z|< 1, then for every real or complex number β with |β|≤ 1, and |z|=1, R ≥ 1, it is proved by Dewan
【基金项目】
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Acknowledgments The paper is supported partially by a research grant from Shahrood University of Technology. The authors are grateful to the referees for careful reading of the paper and for the comme