@BOOK{reichl2008tol, title = {Tracking of Laparoscopic Ultrasound. Error Correction for Electromagnetic Tracking.}, publisher = {VDM Verlag, Saarbrücken}, year = {2008}, author = {Tobias Reichl}, isbn = {978-3-8364-7350-7}, month = {March}, url = {http://www.amazon.de/Tracking-Laparoscopic-Ultrasound-Correction-Electromagnetic/dp/383647350X} }