Costas Vassilakis Giorgos Laskaridis Giorgos Lepouras Stathis Rouvas Panagiotis Georgiadis Transactional e-Government Services: An Integrated Approach. 276-279 2002 conf/egov/2002 EGOV http://link.springer.de/link/service/series/0558/bibs/2456/24560276.htm db/conf/egov/egov2002.html#VassilakisLLRG02