To cite package 'RCAL' in publications use:

Tan Z, Sun B (2020). RCAL: Regularized calibrated estimation. R package version 2.0.

Corresponding BibTeX entry:

  @Manual{,
    title = {RCAL: Regularized calibrated estimation},
    author = {Zhiqiang Tan and Baoluo Sun},
    year = {2020},
    note = {R package version 2.0},
  }