L. C. Kiwu, D. C. . Bartholomew, F. C. . . Kiwu-Lawrence, C. P. Obite, and Okafor Ikechukwu Boniface, “Evaluating Percentage Rotatability For The Small Box – Behnken Design”, jmss, vol. 2, no. 2, pp. 16–24, Aug. 2021, doi: 10.32996/jmss.2021.2.2.3.