@article{yang2013multiscale,
  title={Multiscale segmentation of the skull in MR images for MRI-based attenuation correction of combined MR/PET},
  author={Yang, Xiaofeng and Fei, Baowei},
  journal={Journal of the American Medical Informatics Association},
  volume={20},
  number={6},
  pages={1037--1045},
  year={2013},
  publisher={BMJ Publishing Group BMA House, Tavistock Square, London, WC1H 9JR}
}