Marchetti, Giovanni M. “Independencies Induced from a Graphical Markov Model After Marginalization and Conditioning: The R Package Ggm”. Journal of Statistical Software 15, no. 6 (February 8, 2006): 1–15. Accessed November 22, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v015i06.