BABENKO, V. F.; BORODACHOV, S.V. Optimization of approximate integration of monotone functions of two variables. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 51, n. 7, p. 881–889, 1999. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/4677. Acesso em: 6 dec. 2025.