Lumen: interactive visual and shape display for calm computing. - Ivan Poupyrev; Tatsushi Nashida; Shigeaki Maruyama; Jun Rekimoto; Yasufumi Yamaji (SIGGRAPH Emerging Technologies, 2004)

Actuation and tangible user interfaces: the Vaucanson duck, robots, and shape displays. - Ivan Poupyrev; Tatsushi Nashida; Makoto Okabe (TEI, 2007)