1.
Doronin VG, Ligun AA. Exact constants in inequalities of the jackson type for quadrature formulas. Ukr. Mat. Zhurn. [Internet]. 2000 Jan. 25 [cited 2025 Dec. 5];52(1):46-51. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/4395