Feng Qi, Cristinel Mortici, “Some inequalities for the trigamma function in terms of the digamma function”, Applied Mathematics and Computation, 271, 2015, 502
Li Yin, Jumei Zhang, XiuLi Lin, “Complete monotonicity related to the k-polygamma functions with applications”, Adv Differ Equ, 2019, no. 1, 2019, 364
Bai-Ni Guo, Feng Qi, “A completely monotonic function involving the tri-gamma function and with degree one”, Applied Mathematics and Computation, 218, no. 19, 2012, 9890
Feng Qi, Wen-Hui Li, “A LOGARITHMICALLY COMPLETELY MONOTONIC FUNCTION INVOLVING THE RATIO OF GAMMA FUNCTIONS”, jaac, 5, no. 4, 2015, 626
Li Yin, Li-Guo Huang, Zhi-Min Song, Xiang Kai Dou, “Some monotonicity properties and inequalities for the generalized digamma and polygamma functions”, J Inequal Appl, 2018, no. 1, 2018, 249
Feng Qi, Ravi P. Agarwal, “On complete monotonicity for several classes of functions related to ratios of gamma functions”, J Inequal Appl, 2019, no. 1, 2019, 36
Feng Qi, Bai-Ni Guo, “Complete monotonicity of divided differences of the di- and tri-gamma functions with applications”, Georgian Mathematical Journal, 23, no. 2, 2016, 279
Omelsaad Ahfaf, Ahmed Talat, Mansour Mahmoud, “Bounds and Completely Monotonicity of Some Functions Involving the Functions ψ′(l) and ψ″(l)”, Symmetry, 14, no. 7, 2022, 1420
Feng Qi, Qiu-Ming Luo, “Bounds for the ratio of two gamma functions: from Wendel’s asymptotic relation to Elezović-Giordano-Pečarić’s theorem”, J Inequal Appl, 2013, no. 1, 2013, 542
Bai-Ni Guo, Feng Qi, Jiao-Lian Zhao, Qiu-Ming Luo, “Sharp Inequalities for Polygamma Functions”, Mathematica Slovaca, 65, no. 1, 2015, 103