To cite package ‘gigg’ in publications use:

  Boss J, Mukherjee B (2021). _gigg: Group Inverse-Gamma Gamma
  Shrinkage for Sparse Regression with Grouping Structure_. R package
  version 0.2.1, <https://CRAN.R-project.org/package=gigg>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {gigg: Group Inverse-Gamma Gamma Shrinkage for Sparse Regression with
Grouping Structure},
    author = {Jon Boss and Bhramar Mukherjee},
    year = {2021},
    note = {R package version 0.2.1},
    url = {https://CRAN.R-project.org/package=gigg},
  }