To cite package ‘marelac’ in publications use:

  Soetaert K, Petzoldt T (2021). _marelac: Tools for Aquatic Sciences_.
  R package version 2.1.10,
  <https://r-forge.r-project.org/projects/marelac>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {marelac: Tools for Aquatic Sciences},
    author = {Karline Soetaert and Thomas Petzoldt},
    year = {2021},
    note = {R package version 2.1.10},
    url = {https://r-forge.r-project.org/projects/marelac},
  }