A.P. Farajzadeh (2019) “Turan´ s inequality type for polygamma functions and some new inequalities”, Bulletin of L.N. Gumilyov Eurasian National University. Mathematics, computer science, mechanics series, 126(1), pp. 68–71. Available at: https://bulmathmc.enu.kz/index.php/main/article/view/43 (Accessed: 23 November 2024).