WASET
    Fengshuo Zhang and  Zhouhong Li,  Four Positive Almost Periodic Solutions to an Impulsive Delayed Plankton Allelopathy System with Multiple Exploit (or Harvesting) Terms.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    April 2016, vol. 119(11). 597 - 604
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/10007147.