Shams Armіn. Re-extending Chebyshev’s theorem about Bertrand’s conjecture. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 59, n. 12, p. 1701–1706, 2007. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3424. Acesso em: 6 dec. 2025.