BAOGUO, J. A new oscillation criterion for two-dimensional dynamic systems on time scales. Tamkang Journal of Mathematics, [S. l.], v. 42, n. 2, p. 237–244, 2011. DOI: 10.5556/j.tkjm.42.2011.656. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/656. Acesso em: 2 may. 2024.