Franca Garzotto Paolo Paolini Marco Speroni Birgit Pröll Werner Retschitzegger Wieland Schwinger Ubiquitous Access to Cultural Tourism Portals. 67-72 2004 conf/dexaw/2004 DEXA Workshops http://doi.ieeecomputersociety.org/10.1109/DEXA.2004.170 db/conf/dexaw/dexaw2004.html#GarzottoPSPRS04