To cite package ‘pm3’ in publications use:

LIU Q (2024). pm3: Propensity Score Matching for Unordered 3-Group Data. R package version 0.2.0, https://CRAN.R-project.org/package=pm3.

Corresponding BibTeX entry:

  @Manual{,
    title = {pm3: Propensity Score Matching for Unordered 3-Group
      Data},
    author = {Qiang LIU},
    year = {2024},
    note = {R package version 0.2.0},
    url = {https://CRAN.R-project.org/package=pm3},
  }