To cite package 'PLMIX' in publications use:

  Mollica, C., Tardella, L. (2017). Bayesian Plackett-Luce mixture
  models for partially ranked data. Psychometrika, Vol. 82(2), pages
  442--458, ISSN: 0033-3123, DOI: 10.1007/s11336-016-9530-0.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Bayesian Plackett-Luce mixture models for partially ranked data},
    author = {Cristina Mollica and Luca Tardella},
    year = {2017},
    journal = {Psychometrika},
    volume = {82},
    number = {2},
    pages = {442--458},
    issn = {0033-3123},
    doi = {10.1007/s11336-016-9530-0},
  }

  Mollica, C., Tardella, L. (2014). Epitope profiling via mixture
  modeling for ranked data. Statistics in Medicine, Vol. 33(21), pages
  3738--3758, ISSN: 0277-6715, DOI: 10.1002/sim.6224.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Epitope profiling via mixture modeling for ranked data},
    author = {Cristina Mollica and Luca Tardella},
    year = {2014},
    journal = {Statistics in Medicine},
    volume = {33},
    number = {21},
    pages = {3738--3758},
    issn = {0277-6715},
    doi = {10.1002/sim.6224},
  }