To cite package ‘happign’ in publications use:

Carteron P (2026). happign: R Interface to 'IGN' Web Services. R package version 0.3.8.9000, https://github.com/paul-carteron/happign.

Corresponding BibTeX entry:

  @Manual{,
    title = {happign: R Interface to 'IGN' Web Services},
    author = {Paul Carteron},
    year = {2026},
    note = {R package version 0.3.8.9000},
    url = {https://github.com/paul-carteron/happign},
  }