DAHER, Radouan; EL OUADIH, Salah; HAMMA, Mohamed El. Direct and inverse theorems of approximation theory. MATEMATIKA, [S. l.], v. 33, n. 2, p. 177–189, 2017. DOI: 10.11113/matematika.v33.n2.771. Disponível em: https://matematika.utm.my/index.php/matematika/article/view/771. Acesso em: 18 apr. 2024.