Babenko, V. F., N. P. Korneichuk, and S. A. Pichugov. “Kolmogorov-Type Inequalities for Mixed Derivatives of Functions of Many Variables”. Ukrains’kyi Matematychnyi Zhurnal 56, no. 5 (May 25, 2004): 579–594. Accessed April 27, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/3779.