Furrer R, Sain SR. spam: A Sparse Matrix R Package with Emphasis on MCMC Methods for Gaussian Markov Random Fields. J. Stat. Soft. [Internet]. 2010 Sep. 16 [cited 2024 Nov. 21];36(10):1-25. Available from: https://www.jstatsoft.org/index.php/jss/article/view/v036i10