Li Xue Qiuyu Wang Congkai Li Lisheng An Economic design of residuals MEWMA control chart with variable sampling intervals and sample size. 467-488 2025 February 54 Commun. Stat. Simul. Comput. 2 https://doi.org/10.1080/03610918.2023.2257008 db/journals/cssc/cssc54.html#XueWLA25 streams/journals/cssc