To cite airGR in publications use these two references:

Coron, L., Thirel, G., Delaigue, O., Perrin, C. and Andréassian, V. (2017). The Suite of Lumped GR Hydrological Models in an R package. Environmental Modelling and Software, 94, 166-171.<doi:10.1016/j.envsoft.2017.05.002>.

Coron, L., Delaigue, O., Thirel, G., Perrin, C. and Michel, C. (2019). airGR: Suite of GR Hydrological Models for Precipitation-Runoff Modelling. R package version 1.3.2.23. URL: https://CRAN.R-project.org/package=airGR.

Corresponding BibTeX entries:

  @Article{,
    title = {The Suite of Lumped {GR} Hydrological Models in an {R}
      package},
    author = {L. Coron and G. Thirel and O. Delaigue and C. Perrin and
      V. Andréassian},
    journal = {Environmental Modelling and Software},
    year = {2017},
    pages = {166-171},
    volume = {94},
    doi = {10.1016/j.envsoft.2017.05.002},
  }
  @Manual{,
    title = {{airGR}: Suite of {GR} Hydrological Models for
      Precipitation-Runoff Modelling},
    author = {L. Coron and O. Delaigue and G. Thirel and C. Perrin and
      C. Michel},
    journal = {R News},
    year = {2019},
    note = {R package version 1.3.2.23},
    url = {https://CRAN.R-project.org/package=airGR},
  }