To cite package ‘hdqr’ in publications use:

  Tang Q, Zhang Y, Wang B (2025). _hdqr: Fast Algorithm for Penalized
  Quantile Regression_. R package version 1.0.1,
  <https://CRAN.R-project.org/package=hdqr>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {hdqr: Fast Algorithm for Penalized Quantile Regression},
    author = {Qian Tang and Yikai Zhang and Boxiang Wang},
    year = {2025},
    note = {R package version 1.0.1},
    url = {https://CRAN.R-project.org/package=hdqr},
  }