Open Science Research Excellence
Ling Liu and  Yuan Ye,  Existence and Uniqueness of Periodic Solution for a Discrete-time SIR Epidemic Model with Time Delays and Impulses.   journal   = {International Journal of Mathematical, Computational, Physical, Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology. September 2011, vol. 57(9). 1515 - 1521[viewed 18 February 2019]. Available from: http://waset.org/publications/15019.