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Building the e-Service society : e-Commerce, e-Business, and e-Government: IFIP 18th World Computer Congress TC6/TC8/TC11 4th International Conference on E-Commerce, E-Business, E-Government (13E 2004) 22-27 August 2004 Toulouse, France / ed. by Winfried Lamersdorf, Volker Tschammer, Stéphane Amarger