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

  Herb Holyst and Wade Rogers (2009). flowFP: Fingerprinting for Flow
  Cytometry. R package version 1.63.0.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {flowFP: Fingerprinting for Flow Cytometry},
    author = {Herb Holyst and Wade Rogers},
    year = {2009},
    note = {R package version 1.63.0},
  }