To cite frailtypack in publications use:

Rondeau V, Mazroui Y, R. Gonzalez J (2012). “frailtypack: An R Package for the Analysis of Correlated Survival Data with Frailty Models Using Penalized Likelihood Estimation or Parametrical Estimation.” Journal of Statistical Software, 47(4), 1-28. https://www.jstatsoft.org/v47/i04/.

Rondeau V, R. Gonzalez J (2005). “Frailtypack: A computer program for the analysis of correlated failure time data using penalized likelihood estimation.” Computer Methods and Programs in Biomedicine, 80(2), 154-164.

To cite frailtypack in publications use:

Król A, Mauguen A, Mazroui Y, Laurent A, Michiels S, Rondeau V (2017). “Tutorial in Joint Modeling and Prediction: A Statistical Software for Correlated Longitudinal Outcomes, Recurrent Events and a Terminal Event.” Journal of Statistical Software, 81(3), 1–52. doi:10.18637/jss.v081.i03.

To cite frailtypack in publications use:

Rondeau V, Gonzalez J, Mazroui Y, Mauguen A, Diakite A, Laurent A, Lopez M, Król A, Sofeu C (2019). frailtypack: General Frailty Models: Shared, Joint and Nested Frailty Models with Prediction; Evaluation of Failure-Time Surrogate Endpoints. R package version 3.0.3, https://CRAN.R-project.org/package=frailtypack.

Corresponding BibTeX entries:

  @Article{,
    title = {{frailtypack}: An {{R}} Package for the Analysis of
      Correlated Survival Data with Frailty Models Using Penalized
      Likelihood Estimation or Parametrical Estimation},
    author = {Virginie Rondeau and Yassin Mazroui and Juan {R.
      Gonzalez}},
    journal = {Journal of Statistical Software},
    year = {2012},
    volume = {47},
    number = {4},
    pages = {1-28},
    url = {https://www.jstatsoft.org/v47/i04/},
  }

  @Article{,
    title = {Frailtypack: A computer program for the analysis of
      correlated failure time data using penalized likelihood
      estimation},
    author = {Virginie Rondeau and Juan {R. Gonzalez}},
    journal = {Computer Methods and Programs in Biomedicine},
    year = {2005},
    volume = {80},
    number = {2},
    pages = {154-164},
  }

  @Article{,
    title = {Tutorial in Joint Modeling and Prediction: A Statistical
      Software for Correlated Longitudinal Outcomes, Recurrent Events
      and a Terminal Event},
    author = {Agnieszka Kr\'{o}l and Audrey Mauguen and Yassin Mazroui
      and Alexandre Laurent and Stefan Michiels and Virginie Rondeau},
    journal = {Journal of Statistical Software},
    year = {2017},
    volume = {81},
    number = {3},
    pages = {1--52},
    doi = {10.18637/jss.v081.i03},
  }

  @Manual{,
    title = {{frailtypack}: General Frailty Models: Shared, Joint and
      Nested Frailty Models with Prediction; Evaluation of Failure-Time
      Surrogate Endpoints},
    author = {Virginie Rondeau and Juan R. Gonzalez and Yassin Mazroui
      and Audrey Mauguen and Amadou Diakite and Alexandre Laurent and
      Myriam Lopez and Agnieszka Kr\'{o}l and Casimir L. Sofeu},
    year = {2019},
    note = {{R} package version 3.0.3},
    url = {https://CRAN.R-project.org/package=frailtypack},
  }