To cite pec in publications use:

Ulla B. Mogensen, Hemant Ishwaran, Thomas A. Gerds (2012). Evaluating Random Forests for Survival Analysis Using Prediction Error Curves. Journal of Statistical Software, 50(11), 1-23. URL http://www.jstatsoft.org/v50/i11/.

Corresponding BibTeX entry:

  @Article{,
    title = {Evaluating Random Forests for Survival Analysis Using
      Prediction Error Curves},
    author = {Ulla B. Mogensen and Hemant Ishwaran and Thomas A.
      Gerds},
    journal = {Journal of Statistical Software},
    year = {2012},
    volume = {50},
    number = {11},
    pages = {1--23},
    url = {http://www.jstatsoft.org/v50/i11/},
  }