V. F. Babenko, N. P. Korneichuk, V. A. Kofanov, and S. A. Pichugov, “Inequalities for upper bounds of functionals on the classes $W^r H^{ω}$ and their applications”, Ukr. Mat. Zhurn., vol. 52, no. 1, pp. 66–84, Jan. 2000, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/4398