Oke, I.A., K.T. Oladepo, and M.O. Ogedengbe. 2010. “Utilization of 2k Factorial Experiments For the Determination of Factors That Influence Electrochemical Process”. Ife Journal of Technology 19 (2):48-54. http://ijt.oauife.edu.ng/index.php/ijt/article/view/66.