Polzehl, Jörg, and Karsten Tabelow. “Structural Adaptive Smoothing in Diffusion Tensor Imaging: The R Package Dti”. Journal of Statistical Software 31, no. 9 (September 15, 2009): 1–23. Accessed April 24, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v031i09.