Thandapani, E., and V. Piramanantham. “Oscillation Criteria for Second Order Nonlinear Neutral Dynamic Equations on Time Scales”. Tamkang Journal of Mathematics 43, no. 1 (March 31, 2012): 109–122. Accessed July 6, 2022. https://journals.math.tku.edu.tw/index.php/TKJM/article/view/1130.