Pan Wang and Yongkun Li, Multiple Positive Periodic Solutions to a Predator-prey system with Harvesting Terms and Holling II Type Functional Response. journal = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology. December 2011, vol. 60(12). 1882 - 1889 [viewed 23 September 2024]. Available from: https://publications.waset.org/pdf/11513.