Kang-Hung Yang and  Jin-Yuan Hsu,  A New SIR-based Model for Influenza Epidemic.   journal   = {International Journal of Health and Medical Engineering}, [online]. World Academy of Science, Engineering and Technology.
    July 2012, vol. 67(7). 701 - 706
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/1303.