Jörg Müller Juliane Exeler Markus Buzeck Antonio Krüger ReflectiveSigns: Digital Signs That Adapt to Audience Attention. 17-24 2009 Pervasive http://dx.doi.org/10.1007/978-3-642-01516-8_3 conf/pervasive/2009 db/conf/pervasive/pervasive2009.html#MullerEBK09