To cite package ‘vecmatch’ in publications use:

  Kolek M (2025). _vecmatch: Generalized Propensity Score Estimation
  and Matching for Multiple Groups_. R package version 1.0.2,
  <https://github.com/polymerase3/vecmatch>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {vecmatch: Generalized Propensity Score Estimation and Matching for
Multiple Groups},
    author = {Mateusz Kolek},
    year = {2025},
    note = {R package version 1.0.2},
    url = {https://github.com/polymerase3/vecmatch},
  }