@inproceedings{rohlfing2004progressive,
	doi = {10.1007/978-3-540-30135-6_77},
	pages = {631--638},
	year = {2004},
	booktitle = {International Conference on Medical Image Computing and Computer-Assisted Intervention (MICCAI)},
	author = {Torsten Rohlfing and Daniel B. Russakoff and Joachim Denzler and Calvin R. Maurer},
	title = {Progressive Attenuation Fields: Fast 2D-3D Image Registration Without Precomputation},
}