@inproceedings{rohlfing2004markerless,
	pages = {5-12},
	year = {2004},
	booktitle = {International Workshop on Vision, Modelling, and Visualization (VMV)},
	author = {Torsten Rohlfing and Joachim Denzler and Daniel B. Russakoff and Christoph Gräßl and Calvin R. Maurer},
	title = {Markerless Real-Time Target Region Tracking: Application to Frameless Sterotactic Radiosurgery},
}