To cite package ‘RNiftyReg’ in publications use:

  Clayden J, Modat M, Presles B, Anthopoulos T, Daga P (2024).
  _RNiftyReg: Image Registration Using the 'NiftyReg' Library_. R
  package version 2.8.4, <https://github.com/jonclayden/rniftyreg>.

A BibTeX entry for LaTeX users is

  @Manual{,
    title = {RNiftyReg: Image Registration Using the 'NiftyReg' Library},
    author = {Jon Clayden and Marc Modat and Benoit Presles and Thanasis Anthopoulos and Pankaj Daga},
    year = {2024},
    note = {R package version 2.8.4},
    url = {https://github.com/jonclayden/rniftyreg},
  }