R. Kongnuy and  E. Naowanich,  The Integrated Studies of Infectious Disease Using Mathematical Modeling and Computer Simulation.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    December 2012, vol. 72(12). 1651 - 1658
    [viewed 15 October 2019]. Available from: https://publications.waset.org/pdf/1502.