Excellence in Research and Innovation for Humanity
Kaihong Zhao,  Existence of Multiple Positive Periodic Solutions to n Species Nonautonomous Lotka-Volterra Cooperative Systems with Harvesting Terms.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. August 2012, vol. 68(8). 819 - 824[viewed 22 July 2018]. Available from: http://waset.org/publications/12665.