@article{frisén_2011,  title={On multivariate control charts},  volume={21},  ISSN={0103-6513},  url={https://doi.org/10.1590/S0103-65132011005000010},  DOI={10.1590/S0103-65132011005000010},  number={2},  journal={Production},  publisher={Associação Brasileira de Engenharia de Produção},  author={Frisén, Marianne},  year={2011},  month={Apr},  pages={235–241} }