To cite 'quadrupen' in publications, please use:

Julien Chiquet. Quadrupen: Sparse and Group Sparse Linear Models, R Package, 2026.

Y. Grandvalet, J. Chiquet and C. Ambroise. Sparsity by Worst-Case Quadratic Penalties, arXiv preprint, 2012.

Corresponding BibTeX entries:

  @Manual{,
    author = {Julien Chiquet},
    title = {Quadrupen: Sparse and Group Sparse Linear Models},
    year = {2026},
    url = {https://github.com/jchiquet/quadrupen},
  }

  @Article{quadrupen,
    title = {Sparsity by Worst-Case Quadratic Penalties},
    author = {Yves Grandvalet and Julien Chiquet and Christophe
      Ambroise},
    journal = {arXiv preprint},
    year = {2012},
    url = {https://arxiv.org/abs/1210.2077},
  }