Witwit, A. R. H., A. Yasin, A. Yasin, H. Gitano, H. Gitano, M. I. Mahmood, and M. I. Mahmood. “Best Multiple Non-Linear Model Factors for Knock Engine (SI) by Using ANFIS”. Asian Journal of Applied Sciences, vol. 2, no. 4, Aug. 2014, https://www.ajouronline.com/index.php/AJAS/article/view/1358.