Improve Bounds of some Arithmetical Functions. JOURNAL OF UNIVERSITY OF BABYLON for Pure and Applied Sciences, [S. l.], v. 26, n. 2, p. 326–331, 2019. Disponível em: https://mail.journalofbabylon.com/index.php/JUBPAS/article/view/2229. Acesso em: 4 aug. 2025.