Somerville, Paul N. “A Fortran 90 Program for Evaluation of Multivariate Normal and Multivariate T Integrals Over Convex Regions”. Journal of Statistical Software 3, no. 4 (February 17, 1999): 1–10. Accessed May 6, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v003i04.