Kalema, George, and Geert Molenberghs. “Generating Correlated and/Or Overdispersed Count Data: A SAS Implementation”. Journal of Statistical Software, Code Snippets 70, no. 1 (April 13, 2016): 1–20. Accessed May 4, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v070c01.