To cite package ‘refund’ in publications use:

Goldsmith J, Scheipl F, Huang L, Wrobel J, Di C, Gellar J, Harezlak J, McLean MW, Swihart B, Xiao L, Crainiceanu C, Reiss PT, Cui E (2026). refund: Regression with Functional Data. R package version 0.1-40, https://github.com/refunders/refund.

Corresponding BibTeX entry:

  @Manual{,
    title = {refund: Regression with Functional Data},
    author = {Jeff Goldsmith and Fabian Scheipl and Lei Huang and Julia
      Wrobel and Chongzhi Di and Jonathan Gellar and Jaroslaw Harezlak
      and Mathew W. McLean and Bruce Swihart and Luo Xiao and Ciprian
      Crainiceanu and Philip T. Reiss and Erjia Cui},
    year = {2026},
    note = {R package version 0.1-40},
    url = {https://github.com/refunders/refund},
  }