@incollection{TUW-138993, author = {Tjoa, A Min and Werthner, Hannes}, title = {E-commerce and Tourism: Retrospectives and Perspectives}, booktitle = {The Digital Economy - Anspruch und Wirklichkeit}, year = {2004}, editor = {Stanoevska-Slabeva, Katarina}, pages = {165--180}, publisher = {Springer}, address = {Berlin Heidelberg}, isbn = {3-540-20850-x} }