Mortici, Cristinel. “Sharp Bounds for Gamma and Digamma Function Arising from Burnside’s Formula”. Rev. Anal. Numér. Théor. Approx. 39, no. 1 (February 1, 2010): 69–72. Accessed November 23, 2024. https://ictp.acad.ro/jnaat/journal/article/view/2010-vol39-no1-art6.