@inproceedings{fei1998frameless,
  title={Frameless stereotactic localization and multimodal image registration using DSA/CT/MRI},
  author={Fei, Baowei and Zhuang, Tiange and Hu, Jie and Zhou, Fanmin},
  booktitle={Proceedings of the 20th Annual International Conference of the IEEE Engineering in Medicine and Biology Society. Vol. 20 Biomedical Engineering Towards the Year 2000 and Beyond (Cat. No. 98CH36286)},
  volume={2},
  pages={683--685},
  year={1998},
  organization={IEEE}
}