To cite package ‘TimeVTree’ in publications use:

  Adak S, Xu R (2018). _TimeVTree: Survival Analysis of Time Varying
  Coefficients Using a Tree-Based Approach_. R package version 0.3.1,
  <https://CRAN.R-project.org/package=TimeVTree>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {TimeVTree: Survival Analysis of Time Varying Coefficients Using a
Tree-Based Approach},
    author = {Sudeshna Adak and Ronghui Xu},
    year = {2018},
    note = {R package version 0.3.1},
    url = {https://CRAN.R-project.org/package=TimeVTree},
  }