To cite FHtest in publications use:

Oller R and Langohr K (2017). “FHtest: An R Package for the Comparison of Survival Curves with Censored Data.” Journal of Statistical Software, 81(15), pp. 1–25. doi: 10.18637/jss.v081.i15.

Corresponding BibTeX entry:

  @Article{,
    title = {{FHtest}: An {R} Package for the Comparison of Survival
      Curves with Censored Data},
    author = {Ramon Oller and Klaus Langohr},
    journal = {Journal of Statistical Software},
    year = {2017},
    volume = {81},
    number = {15},
    pages = {1--25},
    doi = {10.18637/jss.v081.i15},
  }