To cite package ‘ssev’ in publications use:

Kaptein M (2019). ssev: Sample Size Computation for Fixed N with Optimal Reward. R package version 0.1.0, https://CRAN.R-project.org/package=ssev.

Corresponding BibTeX entry:

  @Manual{,
    title = {ssev: Sample Size Computation for Fixed N with Optimal
      Reward},
    author = {Maurits Kaptein},
    year = {2019},
    note = {R package version 0.1.0},
    url = {https://CRAN.R-project.org/package=ssev},
  }