Atteya, H., Agwa, H., & Khodier, A. (2015). Oscillation of second-order nonlinear forced dynamic equations with damping on time scales. Acta Mathematica Universitatis Comenianae, 84(1), 133-148. Retrieved from http://www.iam.fmph.uniba.sk/amuc/ojs/index.php/amuc/article/view/89