To cite package 'coxphw' in publications use:

Georg Heinze, Meinhard Ploner, Daniela Dunkler (2017). coxphw: Weighted Estimation in Cox Regression. R package version 4.0.0.

Corresponding BibTeX entry:

  @Manual{,
    title = {coxphw: Weighted Estimation in Cox Regression},
    author = {Georg Heinze and Meinhard Ploner and Daniela Dunkler},
    year = {2017},
    note = {R package version 4.0.0},
  }