Decreasing properties of two ratios defined by three and four polygamma functions

Feng Qi

Comptes Rendus. Mathématique, Volume 360 (2022) no. 1 p. 89-101

Monotonicity and sharp inequalities related to complete $(p,q)$-elliptic integrals of the first kind

Fei Wang; Feng Qi

Comptes Rendus. Mathématique, Volume 358 (2020) no. 8 p. 961-970