To cite textir use the appropriate of:

Taddy, M. (2015) One-Step Estimator Paths for Concave Regularization, http://arxiv.org/abs/1308.5623

Corresponding BibTeX entry:

  @Article{,
    title = {One-Step Estimator Paths for Concave Regularization},
    author = {Matt Taddy},
    year = {2015},
    journal = {http://arxiv.org/abs/1308.5623},
  }