Uba, G., H. Yakasai, A. Abubakar, and M. Y. A. Shukor. “Predictive Mathematical Modelling of the Total Number of COVID-19 Cases for Brazil”. Journal of Environmental Microbiology and Toxicology, vol. 8, no. 1, July 2020, pp. 16-20, doi:10.54987/jemat.v8i1.517.