To cite mlt/basefun/variables in publications use:

  Hothorn T (2020). “Most Likely Transformations: The mlt Package.”
  _Journal of Statistical Software_, *92*(1), 1-68.
  doi:10.18637/jss.v092.i01 <https://doi.org/10.18637/jss.v092.i01>.

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Most Likely Transformations: The {mlt} Package},
    author = {Torsten Hothorn},
    journal = {Journal of Statistical Software},
    year = {2020},
    volume = {92},
    number = {1},
    pages = {1--68},
    doi = {10.18637/jss.v092.i01},
  }