To cite package ‘kader’ in publications use:

  Eichner G (2017). _kader: Kernel Adaptive Density Estimation and
  Regression_. R package version 0.0.8,
  <https://github.com/gerriteichner/kader>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {kader: Kernel Adaptive Density Estimation and Regression},
    author = {Gerrit Eichner},
    year = {2017},
    note = {R package version 0.0.8},
    url = {https://github.com/gerriteichner/kader},
  }