%0 Journal Article %A Feng Qi %T Decreasing properties of two ratios defined by three and four polygamma functions %J Comptes Rendus. Mathématique %D 2022 %P 89-101 %V 360 %I Académie des sciences, Paris %R 10.5802/crmath.296 %G en %F CRMATH_2022__360_G1_89_0