To cite package ‘gfer’ in publications use:

Xu Y (2025). gfer: Green Finance and Environmental Risk. R package version 0.1.12, https://github.com/yuanchao-xu/gfer.

Corresponding BibTeX entry:

  @Manual{,
    title = {gfer: Green Finance and Environmental Risk},
    author = {Yuanchao Xu},
    year = {2025},
    note = {R package version 0.1.12},
    url = {https://github.com/yuanchao-xu/gfer},
  }