Vladimir Stantchev Marten Schönherr Jens Dietrich Layered Government and E-Citizenship: Objectives and Technical Challenges in the EU. 614-619 2009 ICIW http://dx.doi.org/10.1109/ICIW.2009.98 conf/iciw/2009 db/conf/iciw/iciw2009.html#StantchevSD09