To cite the restoptr package in publications, use:

  Justeau‐Allaire D, Hanson JO, Lannuzel G, Vismara P, Lorca X,
  Birnbaum P (2023). restoptr: an R package for ecological restoration
  planning. Restoration Ecology. e13910.
  https://doi.org/10.1111/rec.13910

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Restoptr: An R Package for Ecological Restoration Planning},
    author = {D Justeau-Allaire and JO Hanson and G Lannuzel and P Vismara and X Lorca and P Birnbaum},
    year = {2023},
    journal = {Restoration Ecology},
    pages = {e13910},
    doi = {10.1111/rec.13910},
  }

  Justeau-Allaire D, Vieilledent G, Rinck N, Vismara P, Lorca X &
  Birnbaum P (2021) Constrained optimization of landscape indices in
  conservation planning to support ecological restoration in New
  Caledonia. Journal of Applied Ecology, 58(4), 744‑754.

A BibTeX entry for LaTeX users is

  @Article{,
    author = {D Justeau-Allaire and G Vieilledent and N Rinck and P Vismara and X Lorca and P Birnbaum},
    title = {Constrained optimization of landscape indices in conservation planning to support ecological restoration in New Caledonia},
    journal = {Journal of Applied Ecology},
    year = {2021},
    volume = {58},
    number = {4},
    pages = {744-754},
    doi = {10.1111/1365-2664.13803},
  }

You may also want to cite the package version. Find it with
"help(package=restoptr)".