Yongkun Li and Erliang Xu, Multiple Positive Periodic Solutions of a Competitor-Competitor-Mutualist Lotka-Volterra System with Harvesting Terms. journal = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology. January 2010, vol. 37(1). 55 - 60 [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/12274.