HRUSHKA, Ya. I. Base Changeable Sets and Mathematical Simulation of the Evolution of Systems. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 65, n. 9, p. 1198–1218, 2013. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/2501. Acesso em: 5 dec. 2025.