BAKHTIN, A. K.; TARGONSKII, A. L. Generalized (n, d)-ray systems of points and inequalities for nonoverlapping domains and open sets. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 7, p. 867–879, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2771. Acesso em: 5 dec. 2025.