Peerajit, W., Y. Areepong, and S. Sukparungsee. “Numerical Integral Equation Method for ARL of CUSUM Chart for Long-Memory Process With Non-Seasonal and Seasonal ARFIMA Models”. Thailand Statistician, vol. 16, no. 1, Jan. 2018, pp. 26-37, https://ph02.tci-thaijo.org/index.php/thaistat/article/view/110205.