Changjin Xu and  Yusen Wu,  Frequency Domain Analysis for Hopf Bifurcation in a Delayed Competitive Web-site Model.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    March 2015, vol. 98(2). 138 - 141
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10004338.