Therneau T (2013). A Package for Survival Analysis in S. R package version 2.37-4, http://CRAN.R-project.org/package=survival.

Terry M. Therneau and Patricia M. Grambsch (2000). Modeling Survival Data: Extending the Cox Model. Springer, New York. ISBN 0-387-98784-3.

Corresponding BibTeX entries:

  @Manual{survival-package,
    title = {A Package for Survival Analysis in S},
    author = {Terry M Therneau},
    year = {2013},
    note = {R package version 2.37-4},
    url = {http://CRAN.R-project.org/package=survival},
  }

  @Book{survival-book,
    title = {Modeling Survival Data: Extending the {C}ox Model},
    author = {{Terry M. Therneau} and {Patricia M. Grambsch}},
    year = {2000},
    publisher = {Springer},
    address = {New York},
    isbn = {0-387-98784-3},
  }