Sharp inequalities for the digamma and polygamma functions

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Bounds for the Ratio of Two Gamma Functions (2009, unknown): “For more information on inequalities of volumes of unit balls in R, please see [4, 7, 11], [73, Theorem 1] and [84, Theorem 5] and related references therein.”
A PROPERTY OF LOGARITHMICALLY ABSOLUTELY MONOTONIC FUNCTIONS AND THE LOGARITHMICALLY COMPLETE MONOTONICITY OF A POWER-EXPONENTIAL FUNCTION (2009, methodology): “These techniques have been used in [1, 2, 3, 5, 9, 10, 11, 12, 13, 14, 15, 17, 22, 28, 29, 30, 31, 32, 33, 36, 37, 40, 43, 44, 45, 48, 49, 50, 52, 56] and many other articles.”