A. Shams, “Re-extending Chebyshev’s theorem about Bertrand’s conjecture”, Ukr. Mat. Zhurn., vol. 59, no. 12, pp. 1701–1706, Dec. 2007, Accessed: Feb. 16, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/3424