To cite FRK version 1 (with EM algorithm) in publications use:

Zammit-Mangion A, Cressie N (2021). “FRK: An R Package for Spatial and Spatio-Temporal Prediction with Large Datasets.” Journal of Statistical Software, 98(4), 1–48. doi:10.18637/jss.v098.i04.

To cite FRK version 2 (non-Gaussian data) in publications use:

Sainsbury-Dale M, Zammit-Mangion A, Cressie N (2024). “Modeling Big, Heterogeneous, Non-Gaussian Spatial and Spatio-Temporal Data Using FRK.” Journal of Statistical Software, 108(10), 1–39. doi:10.18637/jss.v108.i10.

Corresponding BibTeX entries:

  @Article{,
    title = {{FRK}: An {R} Package for Spatial and Spatio-Temporal
      Prediction with Large Datasets},
    author = {Andrew Zammit-Mangion and Noel Cressie},
    journal = {Journal of Statistical Software},
    year = {2021},
    volume = {98},
    number = {4},
    pages = {1--48},
    doi = {10.18637/jss.v098.i04},
  }

  @Article{,
    title = {Modeling Big, Heterogeneous, Non-{G}aussian Spatial and
      Spatio-Temporal Data Using {FRK}},
    author = {Matthew Sainsbury-Dale and Andrew Zammit-Mangion and Noel
      Cressie},
    journal = {Journal of Statistical Software},
    year = {2024},
    volume = {108},
    number = {10},
    pages = {1--39},
    doi = {10.18637/jss.v108.i10},
  }