Markus Zanker Matthias Fuchs Wolfram Höpken Mario Tuta Nina Müller Evaluating Recommender Systems in Tourism - A Case Study from Austria. 24-34 2008 ENTER http://dx.doi.org/10.1007/978-3-211-77280-5_3 conf/enter/2008 db/conf/enter/enter2008.html#ZankerFHTM08