@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}
}