O. V. Polyakov, “On the best quadrature formulas for some classes of continuous functions”, Ukr. Mat. Zhurn., vol. 50, no. 9, pp. 1284–1288, Sep. 1998, Accessed: Apr. 13, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4847