USLU, K.; DENIZ, V. The Solutions and Periods of Some Considered Non-Linear Difference Equation Systems. Asian Journal of Applied Sciences, [S. l.], v. 6, n. 5, 2018. DOI: 10.24203/ajas.v6i5.5487. Disponível em: https://ajouronline.com/index.php/AJAS/article/view/5487. Acesso em: 25 jan. 2022.