@incollection{hung2014using, title = {Using and Validating Airborne Ultrasound as a Tactile Interface within Medical Training Simulators}, author = {Hung, Gary MY and John, Nigel W and Hancock, Chris and Hoshi, Takayuki}, booktitle = {Biomedical Simulation}, pages = {30--39}, year = {2014}, publisher = {Springer} }