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Yeong, W.C. and Khoo, M.B.C. and Tham, L.K. and Teoh, W.L. and Rahim, M.A. (2017) Monitoring the Coefficient of Variation Using a Variable Sampling Interval EWMA Chart. Journal of Quality Technology, 49 (4). pp. 380-401. ISSN 0022-4065, DOI https://doi.org/10.1080/00224065.2017.11918004.