@article {Ungi2013e,
	title = {Ultrasound Snapshots in Percutaneous Pedicle Screw Placement Navigation: A Feasibility Study},
	journal = {Clinical Orthopaedics and Related Research},
	year = {2013},
	month = {2013},
	author = {Tamas Ungi and Eric Moult and Joseph H. Schwab and Gabor Fichtinger}
}
