1.
Chen C-P, Qi F. Completely monotonic function associated with the Gamma functions and proof of Wallis’ inequality. Tamkang J. Math. [Internet]. 2005 Dec. 31 [cited 2024 Nov. 21];36(4):303-7. Available from: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/101