WASET
    K. Patanarapelert and  I.M. Tang,  Effect of Time Delay on the Transmission of Dengue Fever.   journal   = {International Journal of Mathematical and Computational Sciences}, [online]. World Academy of Science, Engineering and Technology.
    October 2007, vol. 10(10). 490 - 498
    [viewed 19 April 2024]. Available from: https://publications.waset.org/pdf/12037.