To cite tclust in publications use:

Fritz H, Garcia-Escudero LA, Mayo-Iscar A (2012). “tclust: An R Package for a Trimming Approach to Cluster Analysis.” Journal of Statistical Software, 47(12), 1–26. https://www.jstatsoft.org/v47/i12/.

Corresponding BibTeX entry:

  @Article{,
    title = {{tclust}: An {R} Package for a Trimming Approach to
      Cluster Analysis},
    author = {Heinrich Fritz and Luis A. Garcia-Escudero and Agustin
      Mayo-Iscar},
    journal = {Journal of Statistical Software},
    year = {2012},
    volume = {47},
    number = {12},
    pages = {1--26},
    url = {https://www.jstatsoft.org/v47/i12/},
  }