To cite DTR in publications use:

Xinyu Tang, Maria Melguizo (2015). DTR: An R Package for Estimation and Comparison of Survival Outcomes of Dynamic Treatment Regimes. Journal of Statistical Software, 65(7), 1-28. URL http://www.jstatsoft.org/v65/i07/.

Corresponding BibTeX entry:

  @Article{,
    title = {{DTR}: An {R} Package for Estimation and Comparison of
      Survival Outcomes of Dynamic Treatment Regimes},
    author = {Xinyu Tang and Maria Melguizo},
    journal = {Journal of Statistical Software},
    year = {2015},
    volume = {65},
    number = {7},
    pages = {1--28},
    url = {http://www.jstatsoft.org/v65/i07/},
  }