Interaction Technique Using Acoustic Sensing for Different Squeak Sounds Caused by Number of Rubbing Fingers. - Ryosuke Kawakatsu; Shigeyuki Hirai (UIST (Adjunct Volume), 2016)

RapTapBath: User Interface System by Tapping on a Bathtub Edge Utilizing Embedded Acoustic Sensors. - Tomoyuki Sumida; Shigeyuki Hirai; Daiki Ito; Ryosuke Kawakatsu (ISS, 2017)

Rubbinput: An Interaction Technique for Wet Environments Utilizing Squeak Sounds Caused by Finger-Rubbing. - Ryosuke Kawakatsu; Shigeyuki Hirai (PerCom Workshops, 2018)