MARTYNYUK, A. E. On one combined approximate method . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 23, n. 6, p. 781–788, 1971. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8627. Acesso em: 7 dec. 2025.