BABENKO, V. F.; PICHUGOV, S. A. On Kolmogorov-type inequalities for fractional derivatives of functions of two variables. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 60, n. 6, p. 837–842, 2008. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3200. Acesso em: 5 dec. 2025.