WASET
    Da-Xue Chen and  Guang-Hui Liu,  Oscillation Criteria for Nonlinear Second-order Damped Delay Dynamic Equations on Time Scales.   journal   = {International Journal of Physical and Mathematical Sciences}, [online]. World Academy of Science, Engineering and Technology.
    January 2010, vol. 37(1). 185 - 192
    [viewed 29 March 2024]. Available from: https://publications.waset.org/pdf/10351.