Da-Xue Chen and Guang-Hui Liu, Oscillation Theorems for Second-order Nonlinear Neutral Dynamic Equations with Variable Delays and Damping. journal = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology. February 2011, vol. 50(2). 192 - 200 [viewed 19 September 2024]. Available from: https://publications.waset.org/pdf/2411.