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, Xiao-Ting Shi, Fang-Fang Liu, “Several identities involving the falling and rising factorials and the Cauchy, Lah, and Stirling numbers”, Acta Universitatis Sapientiae, Mathematica, 8, no. 2, 2016, 282
Feng Qi, Wen-Hui Li, “A LOGARITHMICALLY COMPLETELY MONOTONIC FUNCTION INVOLVING THE RATIO OF GAMMA FUNCTIONS”, jaac, 5, no. 4, 2015, 626