Haptic and audio interaction design : 4th international conference, HAID 2009, Dresden, Germany, September 10-11, 2009 : proceedings / Ercan Altinsoy, Ute Jekosch, Stephen Brewster (eds.). - Altinsoy, M. Ercan; Jekosch, Ute; Brewster, Stephen, 1967- (Lecture notes in computer science, 2009)