Changjin Xu and  Peiluan Li,  Stability Analysis in a Fractional Order Delayed Predator-Prey Model.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2013, vol. 77(5). 859 - 862
    [viewed 15 August 2020]. Available from: https://publications.waset.org/pdf/16751.