POLYAKOV, O. V.; POLYAKOVA, N. O. Best cubature formulas for some classes of continuous functions of two variables. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 61, n. 4, p. 572–576, 2009. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3042. Acesso em: 9 dec. 2025.