etPlanner: An IT Framework for Comprehensive and Integrative Travel Guidance. - Wolfram Höpken; Matthias Fuchs; Markus Zanker; Thomas Beer; Alexander Eybl; Stefan Flores; Sergiu Gordea; Markus Jessenitschnig; Thomas Kerner; Dirk Linke; Jörg Rasinger; Michael Schnabl (ENTER, 2006)