1. Handbook of Mathematical Functions with Formulas, Graphs, and Mathematical Tables,1965
2. Integral representation of some functions related to the gamma function;Berg;Mediterr. J. Math.,2004
3. On gamma function inequalities;Bustoz;Math. Comp.,1986
4. Monotonicity and convexity for the gamma function;Chen;J. Inequal. Pure Appl. Math.,2005
5. The best bounds in Gautschi’s inequality;Elezović;Math. Inequal. Appl.,2000