To cite 'quadrupen' in publications, please use:

Grandvalet Y, Chiquet J, Ambroise C (2018). “Sparsity by Worst-Case Quadratic Penalties.” arXiv preprint. http://arxiv.org/abs/1210.2077.

Corresponding BibTeX entry:

  @TechReport{,
    author = {Yves Grandvalet and Julien Chiquet and Christophe
      Ambroise},
    title = {Sparsity by Worst-Case Quadratic Penalties},
    institution = {arXiv preprint},
    year = {2018},
    url = {http://arxiv.org/abs/1210.2077},
  }