CookieFlavors: easy building blocks for wireless tangible input. - Hiroaki Kimura; Eiji Tokunaga; Yohei Okuda; Tatsuo Nakajima (CHI Extended Abstracts, 2006)

Lifestyle Ubiquitous Gaming: Making Daily Lives More Plesurable. - Tatsuo Nakajima; Vili Lehdonvirta; Eiji Tokunaga; Masaaki Ayabe; Hiroaki Kimura; Yohei Okuda (RTCSA, 2007)