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On the zero bounds of polynomials and regular functions of a quaternionic variable

In this manuscript, we are concerned with the problem of locating the zeros
 of some special quaternionic polynomials and regular functions with
 restricted coefficients; namely quaternionic coefficients whose real
 components or their moduli satisfy suitable inequalities. The obtained
 results for this subclass of quaternionic polynomials and regular functions
 produce extensions of the classical Enestr?m-Kakeya theorem and its various
 variants from complex to the quaternionic setting.