BABENKO , V. F.; PICHUGOV , S. A. Inequality of the Bernshtein type for polynomial splines in the space $L_2$. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 43, n. 3, p. 420–422, 1991. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/9625. Acesso em: 17 feb. 2026.