K. G. Valeev, “Application of the asymptotic method to a critical case of binary zero root ”, Ukr. Mat. Zhurn., vol. 23, no. 3, pp. 364–367, Apr. 1971, Accessed: Feb. 17, 2026. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/8563