To cite the R package smoothHR in publications use:

Artur Agostinho Araújo and Luís Meira-Machado (2014). smoothHR: Smooth Hazard Ratio Curves taking a Reference Value. R package version 1.0.1 URL http://CRAN.R-project.org/package=smoothHR
Luís Meira-Machado, Carmen Cadarso-Suárez, Francisco Gude, and Artur Araújo, “smoothHR: An R Package for Pointwise Nonparametric Estimation of Hazard Ratio Curves of Continuous Predictors,” Computational and Mathematical Methods in Medicine, vol. 2013, Article ID 745742, 11 pages, 2013. doi:10.1155/2013/745742

Corresponding BibTeX entries:

  @Manual{,
    title = {smoothHR: Smooth Hazard Ratio Curves taking a Reference
      Value},
    author = {Artur Agostinho Ara\'{u}jo and Lu\'{i}s Meira-Machado},
    year = {2014},
    note = {R package version 1.0.1},
    url = {http://CRAN.R-project.org/package=smoothHR},
  }
  @Article{,
    title = {smoothHR: An R Package for Pointwise Nonparametric
      Estimation of Hazard Ratio Curves of Continuous Predictors},
    author = {Lu\'{i}s Meira-Machado and Carmen Cadarso-Su\'{a}rez and
      Francisco Gude and Artur Ara\'{u}jo},
    journal = {Computational and Mathematical Methods in Medicine},
    issn = {1748-6718},
    year = {2013},
    volume = {2013},
    pages = {1--11},
    doi = {10.1155/2013/745742},
  }