Three classes of logarithmically completely monotonic functions involving gamma and psi functions

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Bounds for the Ratio of Two Gamma Functions (2009, background): “It is clear that the papers [109, 111, 139] take a different direction from [150] to generalize and refine inequalities in (6.”
A Completely Monotonic Function Involving Divided Differences of Psi and Polygamma Functions and an Application (2006, unknown): “…polygamma functions ψ(i)(x) for i ∈ N are several of the most important special functions and have much extensive applications in many branches such as statistics, probability, number theory, theory of 0-1 matrices, graph theory, combinatorics, physics, engineering, and other mathematical sciences.”