VOLOSHYN, H. A.; KOSOVAN, V. M.; MASLYUCHENKO, V. K. Haar’s condition and joint polynomiality of separate polynomial functions. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 69, n. 1, p. 17–27, 2017. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1673. Acesso em: 5 dec. 2025.