To cite in publications use:

Kurt Hornik (2014). clue: Cluster ensembles. R package version 0.3-48. URL http://CRAN.R-project.org/package=clue.
Kurt Hornik (2005). A CLUE for CLUster Ensembles. Journal of Statistical Software 14/12. URL http://www.jstatsoft.org/v14/i12/.

Corresponding BibTeX entries:

  @Manual{,
    title = {clue: Cluster ensembles},
    author = {Kurt Hornik},
    year = {2014},
    note = {R package version 0.3-48.},
    url = {http://CRAN.R-project.org/package=clue},
  }
  @Article{,
    title = {A {CLUE} for {CLUster Ensembles}},
    author = {Kurt Hornik},
    year = {2005},
    journal = {Journal of Statistical Software},
    volume = {14},
    number = {12},
    url = {http://www.jstatsoft.org/v14/i12/},
    month = {September},
  }