Rodrigues, Isabela Pereira, et al. “Surveillance Analysis and Monitoring of Multidrug-Resistant Bacteria Incidence in an Intensive Care Unit: The Role of Cumulative Sum Control Charts”. International Journal of Sciences: Basic and Applied Research (IJSBAR), vol. 23, no. 1, June 2015, pp. 217-29, https://www.gssrr.org/JournalOfBasicAndApplied/article/view/4067.