To cite ibr in publications use:

  Pierre-Andre Cornillon, Nicolas Hengartner, Eric Matzner-Lober
  (2017). Iterative Bias Reduction Multivariate Smoothing in R: The ibr
  Package. Journal of Statistical Software, 77(9), 1-26.
  doi:10.18637/jss.v077.i09

A BibTeX entry for LaTeX users is

  @Article{,
    title = {Iterative Bias Reduction Multivariate Smoothing in {R}: The {ibr} Package},
    author = {Pierre-Andr\'e Cornillon and Nicolas Hengartner and Eric Matzner-L{\o}ber},
    journal = {Journal of Statistical Software},
    year = {2017},
    volume = {77},
    number = {9},
    pages = {1--26},
    doi = {10.18637/jss.v077.i09},
  }