Kejun Zhuang and  Zhaohui Wen,  Periodic Solutions for a Delayed Population Model on Time Scales.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    July 2010, vol. 43(7). 1010 - 1012
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/6326.