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To cite igrf in publications use:

Hufkens K (2022). “igrf: The 13th Generation International Geomagnetic Reference Field (IGRF) implemented as an R package.” doi:10.5281/zenodo.6527638, https://bluegreen-labs.github.io/igrf/.

Corresponding BibTeX entry: 

  @Misc{,
    title = {igrf: The 13th Generation International Geomagnetic
      Reference Field (IGRF) implemented as an R package},
    author = {Koen Hufkens},
    year = {2022},
    doi = {10.5281/zenodo.6527638},
    url = {https://bluegreen-labs.github.io/igrf/},
  }

These binaries (installable software) and packages are in development.
They may not be fully stable and should be used with caution. We make no claims about them.