To cite package ‘REN’ in publications use:

  Dixit H, Wang S, Koo B, Looi C, Wang H (2025). _REN: Regularization
  Ensemble for Robust Portfolio Optimization_. R package version 0.1.0,
  <https://github.com/bonsook/ren>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {REN: Regularization Ensemble for Robust Portfolio Optimization},
    author = {Hardik Dixit and Shijia Wang and Bonsoo Koo and Cash Looi and Hong Wang},
    year = {2025},
    note = {R package version 0.1.0},
    url = {https://github.com/bonsook/ren},
  }