Risser, Mark D., and Catherine A. Calder. “Local Likelihood Estimation for Covariance Functions With Spatially-Varying Parameters: The ConvoSPAT Package for R”. Journal of Statistical Software 81, no. 14 (November 13, 2017): 1–32. Accessed November 24, 2024. https://www.jstatsoft.org/index.php/jss/article/view/v081i14.