Christopher R. Wagner Douglas P. Perrin Robert D. Howe Nikolay V. Vasilyev Pedro J. del Nido Force Feedback in a Three-Dimensional Ultrasound-Guided Surgical Task. 5 2006 conf/haptics/2006 HAPTICS http://doi.ieeecomputersociety.org/10.1109/VR.2006.63 db/conf/haptics/haptics2006.html#WagnerPHVN06