1. Ministerial Declaration approved unanimously on the Ministerial eGovernment Conference of the United Kingdom Presidency, Manchester (November 24, 2005)
2. European Commission, The European e-Business Report 2006/2007 edition, A portrait of e-business in 10 sectors of the EU economy, Brussels (January 2007)
3. Arendsen, R., van Engers, T.M.: eTaxation and the Reduction of the Administrative Burden. In: E-Taxation: State & Perspectives. Trauner Verlag, Linz (2007)
4. Lecture Notes in Computer Science;R. Arendsen,2004
5. Henriksen, H.Z.: Performance, Pressure and Politics: Motivators for Adoption of Interorganizational Information Systems, Copenhagen Business School (March 2002)