To cite funcy in publications use:

Yassouridis C, Ernst D, Leisch F (2018). “Generalization, Combination and Extension of Functional Clustering Algorithms: The R Package funcy.” Journal of Statistical Software, 85(9), 1–25. doi: 10.18637/jss.v085.i09.

Corresponding BibTeX entry:

  @Article{,
    title = {Generalization, Combination and Extension of Functional
      Clustering Algorithms: The {R} Package {funcy}},
    author = {Christina Yassouridis and Dominik Ernst and Friedrich
      Leisch},
    journal = {Journal of Statistical Software},
    year = {2018},
    volume = {85},
    number = {9},
    pages = {1--25},
    doi = {10.18637/jss.v085.i09},
  }