Kai Wang and  Yanling Zu,  Permanence and Global Attractivity of a Delayed Predator-Prey Model with Mutual Interference.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    September 2013, vol. 75(3). 426 - 432
    [viewed 25 May 2020]. Available from: https://publications.waset.org/pdf/16988.