Surface++: A Scalable and Self-sustainable Wireless Sound Sensing Surface. - Nivedita Arora; Qiuyue Xue; Dhruva Bansal; Peter McAughan; Ryan A. Bahr; Diego Osorio; Xiaomeng Ma; Alanson P. Sample; Thad E. Starner; Gregory D. Abowd (MobiSys, 2019)