To cite package ‘tfCox’ in publications use:

Wu J, Witten D (2019). tfCox: Fits Piecewise Polynomial with Data-Adaptive Knots in Cox Model. R package version 0.1.0, https://CRAN.R-project.org/package=tfCox.

Corresponding BibTeX entry:

  @Manual{,
    title = {tfCox: Fits Piecewise Polynomial with Data-Adaptive Knots
      in Cox Model},
    author = {Jiacheng Wu and Daniela Witten},
    year = {2019},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=tfCox},
  }