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Gierad Laput, Eric Brockmeyer, Scott E. Hudson, and Chris Harrison. 2015. Acoustruments: Passive, Acoustically-Driven, Interactive Controls for Handheld Devices. In Proceedings of the 33rd Annual ACM Conference on Human Factors in Computing Systems (CHI '15). ACM, New York, NY, USA, 2161-2170. DOI=10.1145/2702123.2702414 http://doi.acm.org.proxy-um.researchport.umd.edu/10.1145/2702123.2702414