Rida, S. Z., A. S. Abd El Radi, Anas Arafa, and M. Khalil. 2012. “The Effect of the Environmental Parameter on the Hantavirus Infection through a Fractional-Order SI Model”. International Journal of Basic and Applied Sciences 1 (2): 88-99. https://doi.org/10.14419/ijbas.v1i2.26.