Nopiah, Z.M, A Lennie, S Abdullah, M.Z Nuawi, A.Z Nuryazmin, and M.N Baharin. 2012. “The Use of Autocorrelation Function in the Seasonality Analysis for Fatigue Strain Data”. Journal of Asian Scientific Research 2 (11):782-88. https://archive.aessweb.com/index.php/5003/article/view/3428.