Kіbets V. F. and Mіklukhіn О. G., “Extension of a theorem of S. N. Bernstein”, Ukr. Mat. Zhurn., vol. 18, no. 2, pp. 141–142, Mar. 1966, Accessed: Apr. 09, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/8730