To cite spNNGP in publications use:
Finley AO, Datta A, Banerjee S (2022). “spNNGP R Package for Nearest Neighbor Gaussian Process Models.” Journal of Statistical Software, 103(5), 1–40. doi:10.18637/jss.v103.i05.
Corresponding BibTeX entry:
@Article{, title = {{spNNGP} {R} Package for Nearest Neighbor {G}aussian Process Models}, author = {Andrew O. Finley and Abhirup Datta and Sudipto Banerjee}, journal = {Journal of Statistical Software}, year = {2022}, volume = {103}, number = {5}, pages = {1--40}, doi = {10.18637/jss.v103.i05}, }