To cite package ‘tightenBlock’ in publications use:

Rosenbaum P (2023). tightenBlock: Tightens an Observational Block Design by Balanced Subset Matching. R package version 0.1.7, https://CRAN.R-project.org/package=tightenBlock.

Corresponding BibTeX entry:

  @Manual{,
    title = {tightenBlock: Tightens an Observational Block Design by
      Balanced Subset Matching},
    author = {Paul Rosenbaum},
    year = {2023},
    note = {R package version 0.1.7},
    url = {https://CRAN.R-project.org/package=tightenBlock},
  }