To cite package ‘vcrpart’ in publications use:

  Bürgin, R. and G. Ritschard (2017), Coefficient-Wise Tree-Based
  Varying Coefficient Regression with vcrpart. Journal of Statistical
  Software, 80(6), 1-33. doi:10.18637/jss.v080.i06

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Coefficient-Wise Tree-Based Varying Coefficient Regression with vcrpart},
    author = {Reto Bürgin and Gilbert Ritschard},
    journal = {Journal of Statistical Software},
    year = {2017},
    volume = {80},
    number = {6},
    pages = {1--33},
    doi = {10.18637/jss.v080.i06},
  }

  Bürgin, R. and G. Ritschard (2015), Tree-Based Varying Coefficient
  Regression for Longitudinal Ordinal Responses. Computational
  Statistics & Data Analysis 86, 65-80. doi:10.1016/j.csda.2015.01.003

A BibTeX entry for LaTeX users is

  @Article{,
    author = {Reto Bürgin and Gilbert Ritschard},
    title = {Tree-Based Varying-Coefficient Regression for Longitudinal Ordinal Responses},
    journal = {Computational Statistics & Data Analysis},
    year = {2015},
    volume = {86},
    pages = {65--80},
    doi = {10.1016/j.csda.2015.01.003},
  }

  Bürgin, R. and G. Ritschard (2014), A Decorated Parallel Coordinate
  Plot for Categorical Longitudinal Data. The American Statistician
  68(2), 98-103. doi:10.1080/00031305.2014.887591

A BibTeX entry for LaTeX users is

  @Article{,
    author = {Reto Bürgin and Gilbert Ritschard},
    title = {A Decorated Parallel Coordinate Plot for Categorical Longitudinal Data},
    journal = {The American Statistician},
    year = {2014},
    volume = {68},
    pages = {98--103},
    number = {2},
    doi = {10.1080/00031305.2014.887591},
  }

  Bürgin, R. A. (2015). Tree-based methods for moderated regression
  with application to longitudinal data. PhD thesis. University of
  Geneva.

A BibTeX entry for LaTeX users is

  @PhdThesis{,
    author = {Reto Bürgin},
    title = {Tree-based methods for moderated regression with application to longitudinal data},
    doi = {10.13097/archive-ouverte/unige:72616},
    school = {University of Geneva},
    year = {2015},
  }