O. V. Polyakov and N. O. Ruchaevskaya, “On rational functions of the best nonsymmetric approximations in integral metrics”, Ukr. Mat. Zhurn., vol. 64, no. 11, pp. 1575–1577, Nov. 2012, Accessed: Dec. 06, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/2683