Onu, Obineke Henry, and Nmerukini Akani. “Replication of Axial Points in Two-Factor Doehlert and Central Composite Designs With a Single Centre Point”. Faculty of Natural and Applied Sciences Journal of Scientific Innovations 6, no. 3 (May 30, 2025): 106–111. Accessed October 6, 2025. https://fnasjournals.com/index.php/FNAS-JSI/article/view/957.