Khamrod , S., Y. Areepong, S. Sukparungsee, and R. Sunthornwat. “Improving Process Monitoring with a New Modified EWMA Control Chart for ARMA Models: A Case Study on Palm Oil Prices in Thailand”. Thailand Statistician, vol. 24, no. 3, June 2026, pp. 635-53, https://ph02.tci-thaijo.org/index.php/thaistat/article/view/266518.