ZELENYUK, E. G.; MALYKHIN, V. I. Bicolour painting of the Descartes products . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 42, n. 6, p. 850–854, 1990. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8852. Acesso em: 17 apr. 2025.