DUMITRESCU, Sorinel. “Estimates for the Ratio of Gamma Functions by Using Higher Order Roots”. Studia Universitatis Babeș-Bolyai Mathematica, vol. 60, no. 2, June 2015, pp. 173-81, https://studia.reviste.ubbcluj.ro/index.php/subbmathematica/article/view/5714.