WASET
    P. Pongsumpun,  Swine Flu Transmission Model in Risk and Non-Risk Human Population.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    August 2010, vol. 44(8). 1196 - 1201
    [viewed 24 April 2024]. Available from: https://publications.waset.org/pdf/3816.