G. Uba and S. Yahuza, “Test of the Randomness of Residuals and Detection of Potential Outliers for the Morgan-Mercer-Flodin Used in the Fitting of the Prediction of Cumulative Death Cases in Nigeria Due to COVID-19”, Bull Environ Sci Sust Manage, vol. 6, no. 1, pp. 9–13, Jul. 2022.