@article{0031-9155-57-13-4277,
  author={P Steininger and M Neuner and H Weichenberger and G C Sharp and B Winey and G Kametriser and F Sedlmayer and H Deutschmann},
  title={Auto-masked 2D/3D image registration and its validation with clinical cone-beam computed tomography},
  journal={Physics in Medicine and Biology},
  volume={57},
  number={13},
  pages={4277},
  url={http://stacks.iop.org/0031-9155/57/i=13/a=4277},
  year={2012}
}