Lim, A.J.X., Khoo, M.B.C., Yeong, W.C. and Haq, A. 2019. A RUN SUM S CHART WITH TWO SAMPLING INTERVALS. International Journal of Industrial Engineering: Theory, Applications and Practice. 26, 4 (Jul. 2019). DOI:https://doi.org/10.23055/ijietap.2019.26.4.4272.