Usman I. G., Ibrahim M. O., Isah B. Y., Lawal N., and Akinyemi Samuel T. “APPLICATION OF NON-STANDARD FINITE DIFFERENCE METHOD ON COVID-19 MATHEMATICAL MODEL WITH FEAR OF INFECTION”. FUDMA JOURNAL OF SCIENCES 7, no. 4 (August 31, 2023): 357 - 368. Accessed November 21, 2024. https://fjs.fudutsinma.edu.ng/index.php/fjs/article/view/1933.