@incollection{TUW-136991, author = {Tjoa, A Min and Wagner, Roland and W{\"o}{\ss}, Wolfram and P{\"u}hretmair, Franz and Palkoska, J{\"u}rgen}, title = {Advanced Query Mechanisms in Tourism Information Systems}, booktitle = {Proceedings of the International Conference on Information and Communication Technologies in Tourism ENTER 2002}, year = {2002}, pages = {438--447}, publisher = {Springer}, isbn = {3-211-83780-9} }