Anja Naumann Ina Wechsung Jörn Hurtienne Multimodal Interaction: Intuitive, Robust, and Preferred? 93-96 2009 INTERACT (2) http://dx.doi.org/10.1007/978-3-642-03658-3_14 conf/interact/2009-2 db/conf/interact/interact2009-2.html#NaumannWH09