WAHDE, G. An Extremal Problem Related to Bernstein’s Approximation Problem. MATHEMATICA SCANDINAVICA, [S. l.], v. 15, p. 131–141, 1964. DOI: 10.7146/math.scand.a-10736. Disponível em: https://www.mscand.dk/article/view/10736. Acesso em: 30 apr. 2024.