WASET
    Changjin Xu and  Qianhong Zhang,  Periodic Solutions in a Delayed Competitive System with the Effect of Toxic Substances on Time Scales.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    February 2011, vol. 50(2). 170 - 173
    [viewed 23 April 2024]. Available from: https://publications.waset.org/pdf/15291.