USLU, K.; GOKHAN, S. On the Periodicity and Behavior of Solutions of High Order Non-linear System. Asian Journal of Applied Sciences, [S. l.], v. 4, n. 1, 2016. Disponível em: https://ajouronline.com/index.php/AJAS/article/view/3514. Acesso em: 18 jan. 2022.