1. Karimi, H.: Advanced Location-Based Technologies and Services, 1st edn. Taylor & Francis, Boca Raton (2013)
2. Ji, Z.: Development of Tangible Acoustic Interfaces for Human Computer Interaction, 1st edn. Cardiff University, Cardiff (2007)
3. Hassan-Ali, M., Pahlavan, K.: A new statistical model for site-specific indoor radio propagation prediction based on geometric optics and geometric probability. In: Zhang, J., Lei, Y., Poor, V., Chiang, M. (eds.) IEEE Transactions on Wireless Communications, vol. 1, pp. 112–124. IEEE Communications Society, New York (2002)
4. Shumailov, I., Simon, L., Yan, J., Anderson, R.: Hearing your touch: a new acoustic side channel on smartphones.
https://arxiv.org/pdf/1903.11137.pdf
. Accessed 29 Aug 2019
5. Bahl, P., Padmanabhan, V.: RADAR: an in-building RF based user location and tracking system. In: Sidi, M., Rom, R., Schulzrinne, H. (eds.) IEEE INFOCOM 2000, pp. 775–784. IEEE (2000)