ELAM, M. E.; CASE, K. E. A Computer Program to Calculate Two-Stage Short-Run Control Chart Factors for (X,MR) Charts. Journal of Statistical Software, [S. l.], v. 15, n. 11, p. 1–13, 2006. DOI: 10.18637/jss.v015.i11. Disponível em: https://www.jstatsoft.org/index.php/jss/article/view/v015i11. Acesso em: 30 nov. 2022.