Thomas Beer Matthias Fuchs Wolfram Höpken Jörg Rasinger Hannes Werthner CAIPS: A Context-Aware Information Push Service in Tourism. 129-140 2007 ENTER http://dx.doi.org/10.1007/978-3-211-69566-1_13 conf/enter/2007 db/conf/enter/enter2007.html#BeerFHRW07