To cite package ‘picasso’ in publications use:

  Ge J, Li X, Jiang H, Wang M, Zhang T, Liu H, Zhao T (2026). _picasso:
  Sparse Learning with Convex and Concave Penalties_. R package version
  1.5, <https://CRAN.R-project.org/package=picasso>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {picasso: Sparse Learning with Convex and Concave Penalties},
    author = {Jason Ge and Xingguo Li and Haoming Jiang and Mengdi Wang and Tong Zhang and Han Liu and Tuo Zhao},
    year = {2026},
    note = {R package version 1.5},
    url = {https://CRAN.R-project.org/package=picasso},
  }