To cite package 'openCR' in publications use:

  Efford, M. G. (2024). openCR: Open population capture-recapture
  models. R package version 2.2.7.
  https://CRAN.R-project.org/package=openCR/

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {openCR: Open population capture-recapture models},
    author = {Murray Efford},
    year = {2024},
    note = {R package version 2.2.7},
    url = {https://CRAN.R-project.org/package=openCR/},
  }