Fabian Hermann Roland Blach Doris Janssen Thorsten Klein Andreas Schuller Dieter Spath Challenges for User Centered Smart Environments. 407-415 2009 HCI (3) http://dx.doi.org/10.1007/978-3-642-02580-8_44 conf/hci/2009-3 db/conf/hci/hci2009-3.html#HermannBJKSS09