To cite package ‘aftR2’ in publications use:

  Wang Y, Xu R (2023). _aftR2: R-Squared Measure under Accelerated
  Failure Time (AFT) Models_. R package version 0.1.0,
  <https://CRAN.R-project.org/package=aftR2>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {aftR2: R-Squared Measure under Accelerated Failure Time (AFT) Models},
    author = {Yuyao Wang and Ronghui Xu},
    year = {2023},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=aftR2},
  }