@article{joshi2004unbiased,
  author = {Joshi, Sarang and Davis, Brad and Jomier, Matthieu and Gerig, Guido},
  journal = {NeuroImage},
  keywords = {groupwise registration},
  pages = {S151--S160},
  publisher = {Elsevier},
  title = {Unbiased diffeomorphic atlas construction for computational anatomy},
  volume = {23},
  year = {2004}
}