@article {Krupa2007a,
	title = {Real-time 6 DOF Tissue Tracking with B-Mode Ultrasound Using Speckle and Visual Servoing},
	journal = {Medical Image Computing and Computer-Assisted Intervention (MICCAI) Proceedings in Lecture Notes in Computer Science},
	volume = {4792},
	year = {2007},
	pages = {1-8},
	author = {Alexandre Krupa and Gabor Fichtinger and Gregory D. Hager}
}
