DZYUBENKO, H. A. Pointwise estimation of comonotone approximation. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 11, p. 1467–1472, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5585. Acesso em: 5 dec. 2025.