Okango , Ayubu Anapapa, Joseph Kipsigei Koske, and John Muindi Mutiso. “ Analysing Four Factor Second Order Models Using Response Surface Methodology With Application in Germination of Melia Volkensii ”. African Journal of Education,Science and Technology (AJEST) 4, no. 2 (December 28, 2017): Pg 71–101. Accessed April 3, 2026. http://ajest.org/index.php/ajest/article/view/159.