Furrer, Reinhard, and Stephan R. Sain. “Spam: A Sparse Matrix R Package With Emphasis on MCMC Methods for Gaussian Markov Random Fields”. Journal of Statistical Software 36, no. 10 (September 16, 2010): 1–25. Accessed November 21, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v036i10.