To cite the gren package in publications please use:

Münch M, Peeters C, van der Vaart A, van de Wiel M (2018). “The Spectral Condition Number Plot for Regularization Parameter Determination.” arXiv:1805.00389v1 [stat.ME].

Corresponding BibTeX entry:

  @Article{,
    title = {The Spectral Condition Number Plot for Regularization
      Parameter Determination},
    author = {M.M. Münch and C.F.W. Peeters and A.W. {van der Vaart}
      and M.A. {van de Wiel}},
    journal = {arXiv:1805.00389v1 [stat.ME]},
    year = {2018},
  }