Zhaohui Wen, Existence of Periodic Solutions in a Food Chain Model with Holling–type II Functional Response. journal = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology. July 2010, vol. 43(7). 881 - 884 [viewed 19 September 2024]. Available from: https://publications.waset.org/pdf/1116.