Gitunga, Robert Muriungi, Joseph Koske K., and Johnstonne Mutiso M. “Applying the Polynomial Model in Simplex”. International Journal of Sciences: Basic and Applied Research (IJSBAR) 31, no. 1 (January 9, 2017): 101–117. Accessed May 12, 2024. https://www.gssrr.org/index.php/JournalOfBasicAndApplied/article/view/6676.