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 , vol. 6, no. 3, May 2025, pp. 106-11, doi:10.63561/fnas-jsi.v6i3.957.