To cite package ‘ssmodels’ in publications use:

de Souza Bastos F, Barreto de Souza W (2025). ssmodels: Sample Selection Models. R package version 2.0.1, https://github.com/fsbmat-ufv/ssmodels.

Corresponding BibTeX entry:

  @Manual{,
    title = {ssmodels: Sample Selection Models},
    author = {Fernando {de Souza Bastos} and Wagner {Barreto de
      Souza}},
    year = {2025},
    note = {R package version 2.0.1},
    url = {https://github.com/fsbmat-ufv/ssmodels},
  }