Hugo, Alfred K., Goodluck M. Mlay, and Moses B. Kabigi. “Modelling the Impacts of Immigrants on COVID 19 Transmission Dynamics With Control Measures”. Tanzania Journal of Science 48, no. 3 (September 30, 2022): 569–584. Accessed April 25, 2024. https://tjs.udsm.ac.tz/index.php/tjs/article/view/1204.