Babenko, V. F., N. V. Parfinovych, and S. A. Pichugov. 2010. “Sharp Kolmogorov-Type Inequalities for Norms of Fractional Derivatives of Multivariate Functions”. Ukrains’kyi Matematychnyi Zhurnal 62 (3), 301–314. https://umj.imath.kiev.ua/index.php/umj/article/view/2869.