Helmut Berger Michaela Denk Michael Dittenbach Dieter Merkl Andreas Pesenhofer Quo Vadis Homo Turisticus? Towards a Picture-based Tourist Profiler. 87-96 2007 ENTER http://dx.doi.org/10.1007/978-3-211-69566-1_9 conf/enter/2007 db/conf/enter/enter2007.html#BergerDDMP07