To cite relsurv in publications use:

Perme MP, Pavlič K (2018). “Nonparametric Relative Survival Analysis with the R Package relsurv.” Journal of Statistical Software, 87(8), 1–27. doi: 10.18637/jss.v087.i08.

For regression models cite:

M. Pohar, J. Stare (2006). “Relative survival analysis in R.” Computer methods and programs in biomedicine, 81, -6.

Corresponding BibTeX entries:

  @Article{,
    title = {Nonparametric Relative Survival Analysis with the {R}
      Package {relsurv}},
    author = {Maja Pohar Perme and Klemen Pavli\v{c}},
    journal = {Journal of Statistical Software},
    year = {2018},
    volume = {87},
    number = {8},
    pages = {1--27},
    doi = {10.18637/jss.v087.i08},
  }

  @Article{,
    title = {Relative survival analysis in {R}},
    author = {{M. Pohar} and {J. Stare}},
    year = {2006},
    journal = {Computer methods and programs in biomedicine},
    volume = {81},
    issue = {3},
    pages = {-6},
  }