BOJANOV, B. On a formula of Obreshkoff. Ann. Sofia Univ. Fac. Math. and Inf., [S. l.], v. 89, p. 19–21, 1997. Disponível em: https://ftl5.uni-sofia.bg/index.php/fmi/article/view/351. Acesso em: 14 apr. 2025.