Adamantios Koumpis Marios Chatzidimitriou Apostolos Vontas Vassilios Peristeras The 100 euro e-gov portal. 81-84 2007 conf/icegov/2007 ICEGOV http://doi.acm.org/10.1145/1328057.1328077 db/conf/icegov/icegov2007.html#KoumpisCVP07