- Feng Qi, Wen-Hui Li, “A LOGARITHMICALLY COMPLETELY MONOTONIC FUNCTION INVOLVING THE RATIO OF GAMMA FUNCTIONS”, jaac, 5, № 4, 2015, 626
- Zhen-Hang Yang, Yu-Ming Chu, Xiao-Jing Tao, “A Double Inequality for the Trigamma Function and Its Applications”, Abstract and Applied Analysis, 2014, 2014, 1
- Feng Qi, Bai-Ni Guo, “Complete monotonicity of divided differences of the di- and tri-gamma functions with applications”, Georgian Mathematical Journal, 23, № 2, 2016, 279
- Feng Qi, Cristinel Mortici, “Some inequalities for the trigamma function in terms of the digamma function”, Applied Mathematics and Computation, 271, 2015, 502
- Feng Qi, Ravi P. Agarwal, “On complete monotonicity for several classes of functions related to ratios of gamma functions”, J Inequal Appl, 2019, № 1, 2019, 36