@article{khilarea_shirke_2015,  title={Steady-state behavior of nonparametric control charts using sign statistic},  volume={25},  ISSN={0103-6513},  url={https://doi.org/10.1590/0103-6513.113112},  DOI={10.1590/0103-6513.113112},  number={4},  journal={Production},  publisher={Associação Brasileira de Engenharia de Produção},  author={Khilarea, Shashikant Kuber and Shirke, Digambar Tukaram},  year={2015},  month={Oct},  pages={739–749} }