To cite package ‘PenIC’ in publications use:

Liu Y, Lu M (2020). PenIC: Semiparametric Regression Analysis of Interval-Censored Data using Penalized Splines. R package version 1.0.0, https://CRAN.R-project.org/package=PenIC.

Corresponding BibTeX entry:

  @Manual{,
    title = {PenIC: Semiparametric Regression Analysis of
      Interval-Censored Data using Penalized Splines},
    author = {Yan Liu and Minggen Lu},
    year = {2020},
    note = {R package version 1.0.0},
    url = {https://CRAN.R-project.org/package=PenIC},
  }