To cite the R package 'peppm' in publications use:

Demarqui F, Loschi R, Colosimo E (2008). “Estimating the grid of time-points for the piecewise exponential model.” Lifeime Data Analysis, 14(3).

Corresponding BibTeX entry:

  @Article{,
    title = {Estimating the grid of time-points for the piecewise
      exponential model},
    journal = {Lifeime Data Analysis},
    volume = {14},
    number = {3},
    year = {2008},
    author = {Fabio N. Demarqui and Rosangela H. Loschi and Enrico A.
      Colosimo},
  }