THANDAPANI, E.; PONNAMMAL, B. On the oscillation of a nonlinear two-dimensional difference systems. Tamkang Journal of Mathematics, [S. l.], v. 32, n. 3, p. 201–209, 2001. DOI: 10.5556/j.tkjm.32.2001.375. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/375. Acesso em: 19 apr. 2024.