Arjan Geven Reinhard Sefelin Norman Höller Manfred Tscheligi Markus Mayer Always-on information: services and applications on the mobile desktop. 23-32 2008 Mobile HCI http://doi.acm.org/10.1145/1409240.1409244 conf/mhci/2008 db/conf/mhci/mhci2008.html#GevenSHTM08