To cite FME in publications use:

Soetaert, Karline and Petzoldt, Thomas, 2010. Inverse Modelling, Sensitivity and Monte Carlo Analysis in R Using Package FME. Journal of Statistical Software, 33(3), 1-28. URL http://www.jstatsoft.org/v33/i03/.

Corresponding BibTeX entry:

  @Article{,
    title = {Inverse Modelling, Sensitivity and Monte Carlo Analysis in
      {R} Using Package {FME}},
    author = {Karline Soetaert and Thomas Petzoldt},
    journal = {Journal of Statistical Software},
    year = {2010},
    volume = {33},
    number = {3},
    pages = {1--28},
    url = {http://www.jstatsoft.org/v33/i03/},
  }