Costa, Antonio F. B., Maysa S. de Magalhães, and Eugenio K. Epprecht. “Th E Non-Central Chi-Square Chart With Double Sampling”. Brazilian Journal of Operations & Production Management 2, no. 2 (February 8, 2010): 21–38. Accessed November 21, 2024. https://bjopm.org.br/bjopm/article/view/BJV2N2_2005_P2.