A.P. FARAJZADEH. Turan´ s inequality type for polygamma functions and some new inequalities. BULLETIN OF THE L.N. GUMILYOV EURASIAN NATIONAL UNIVERSITY. Mathematics. Computer science. Mechanics series, [S. l.], v. 126, n. 1, p. 68–71, 2019. Disponível em: https://bulmathmc.enu.kz/index.php/main/article/view/43. Acesso em: 18 may. 2024.