@article{su-fen_wen-chi_tzee-ming_chi-chin_smiley_2011,  title={Monitoring process mean with a new EWMA control chart},  volume={21},  ISSN={0103-6513},  url={https://doi.org/10.1590/S0103-65132011005000026},  DOI={10.1590/S0103-65132011005000026},  number={2},  journal={Production},  publisher={Associação Brasileira de Engenharia de Produção},  author={Su-Fen, Yang and Wen-Chi, Tsai and Tzee-Ming, Huang and Chi-Chin, Yang and Smiley, Cheng},  year={2011},  month={Apr},  pages={217–222} }