To cite package ‘lpjclass’ in publications use:

  Waha K, Bodirsky B, Roliniski S, Dietrich J, P. P. Alves M (2023).
  _lpjclass: LPJ Class Functions_. R package version 1.19.7,
  <https://github.com/pik-piam/lpjclass>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {lpjclass: LPJ Class Functions},
    author = {Katharina Waha and Benjamin Bodirsky and Susanne Roliniski and Jan Philipp Dietrich and Marcos {P. P. Alves}},
    year = {2023},
    note = {R package version 1.19.7},
    url = {https://github.com/pik-piam/lpjclass},
  }