@incollection{TUW-140179, author = {Tjoa, A Min and Werthner, Hannes}, title = {Electronic markets and tourism}, booktitle = {Digital Economy - Anspruch und Wirklichkeit}, year = {2004}, editor = {Stanoevska-Slabeva, Katarina}, publisher = {Springer-Verlag}, address = {Heidelberg} }