To cite package 'fscaret' in publications use:

  Szlek Jakub, Paclawski Adam, Lau Raymond,Jachowicz Renata and Mendyk
  Aleksander (2013). Heuristic modeling of macromolecule release from
  PLGA microspheres. International Journal of Nanomedicine, 2013:8(1),
  4601-4611.R package version 0.8.5.3.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Heuristic modeling of macromolecule release from PLGA microspheres.},
    author = {Szlek Jakub and Paclawski Adam and Lau Raymond and Jachowicz Renata and Mendyk Aleksander},
    year = {2013},
    note = {R package version 0.8.5.3},
    journal = {International Journal of Nanomedicine},
    volume = {8},
    number = {1},
    pages = {4601-4611},
  }