@conference {Carbajal2013b,
	title = {Improving N-Wire Phantom-based Freehand Ultrasound Calibration},
	booktitle = {CARS 2013},
	year = {2013},
	author = {Guillermo Carbajal and Andras Lasso and {\'A}lvaro G{\'o}mez and Gabor Fichtinger}
}
