To cite RandomFieldsUtils in publications use:

For general purposes please refer to

  Schlather M, Freudenberg A, Furrer R, Kroll M, Ripley BD, Ratcliff JW
  (2022). _RandomFieldsUtils: Utilites for the Simulation and Analysis
  of Random Fields_. R package version 1.2.5,
  <https://cran.r-project.org/package=RandomFieldsUtils>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {{RandomFieldsUtils}:  Utilites for the Simulation and Analysis of Random Fields},
    author = {Martin Schlather and Alexander Freudenberg and Reinhard Furrer and Martin Kroll and Brian D Ripley and John W. Ratcliff},
    year = {2022},
    note = {R package version 1.2.5},
    url = {https://cran.r-project.org/package=RandomFieldsUtils},
  }