To cite benchden in publications use:

Thoralf Mildenberger, Henrike Weinert (2012). The benchden Package: Benchmark Densities for Nonparametric Density Estimation. Journal of Statistical Software, 46(14), 1-14. URL http://www.jstatsoft.org/v46/i14/.

Corresponding BibTeX entry:

  @Article{,
    title = {The {benchden} Package: Benchmark Densities for
      Nonparametric Density Estimation},
    author = {Thoralf Mildenberger and Henrike Weinert},
    journal = {Journal of Statistical Software},
    year = {2012},
    volume = {46},
    number = {14},
    pages = {1--14},
    url = {http://www.jstatsoft.org/v46/i14/},
  }