To cite package 'PermAlgo' in publications use:

Sylvestre M, Evans T, MacKenzie T, Abrahamowicz M (2010). PermAlgo: Permutational algorith to generate event times conditional on a covariate matrix including time-dependent covariates. R package version 1.2.

Corresponding BibTeX entry:

  @Manual{,
    title = {PermAlgo: Permutational algorith to generate event times
      conditional on a covariate matrix including time-dependent
      covariates},
    author = {Marie-Pierre Sylvestre and Thad Evans and Todd MacKenzie
      and Michal Abrahamowicz},
    year = {2010},
    note = {R package version 1.2},
  }