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Comput."],"published-print":{"date-parts":[[2017,1]]},"abstract":"<jats:p>We describe a method for calculating the roots of special functions satisfying second order ordinary differential equations. It exploits the recent observation that the solutions of equations of this type can be represented via nonoscillatory phase functions, even in the high-frequency regime. Our approach requires $\\mathcal{O}(1)$ operations per root and achieves near machine precision accuracy. Moreover, despite its great generality, our approach is competitive with (and in many cases, faster than) specialized, state-of-the-art methods for the construction of Gaussian quadrature rules of large orders when it is used in such a capacity. 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