SNEYERS, R. Recurrence ou periodicité. JORBEL - Belgian Journal of Operations Research, Statistics, and Computer Science, [S. l.], v. 25, n. 2-3, p. 77–84, 1985. Disponível em: https://www.orbel.be/jorbel/index.php/jorbel/article/view/476. Acesso em: 2 may. 2024.