Open Science Research Excellence
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, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. January 2010, vol. 37(1). 55 - 60[viewed 27 June 2019]. Available from: http://waset.org/publications/12274.