VOLOSHYN, D. E. Structure of nodal algebras. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 63, n. 7, p. 880–879, 2011. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2772. Acesso em: 5 dec. 2025.