To cite package ‘GRCRegression’ in publications use:

Guo X, Fu Q (2023). GRCRegression: Modified Poisson Regression of Grouped and Right-Censored Counts. R package version 1.0, https://CRAN.R-project.org/package=GRCRegression.

Corresponding BibTeX entry:

  @Manual{,
    title = {GRCRegression: Modified Poisson Regression of Grouped and
      Right-Censored Counts},
    author = {Xin Guo and Qiang Fu},
    year = {2023},
    note = {R package version 1.0},
    url = {https://CRAN.R-project.org/package=GRCRegression},
  }