1. EU Commission: Action Plan for the Implementation of the Legal Framework for Electronic Public Procurement. Communication from the Commission to the Council, the European Parliament, the European Economic and Social Committee and the European Committee of the Regions, 2004.
2. EU Commission: Requirements for Conducting Public Procurement Using Electronic Means under the New Public Procurement Directives 2004/18/EC and 2004/17/EC. Commission staff working document, 2005.
3. EU Commission: Action-Plan on e-Signatures and e-Identification to Facilitate the Provision of Cross-Border Public Services in the Single Market, Communication from the Commission to the Council, the European Parliament, the European Economic and Social Committee and the Committee of the Regions, 2008.
4. Certipost: Certification Practice Statement, European ID ABC Bridge/Gateway CA for Public Adminis-trations v2.0. EBGCA-DEL-015, 2005.
5. ETSI: Electronic Signatures and Infrastructures (ESI); Policy Requirements for Certification Au-thorities issuing Qualified Certificates. ETSI TS 101 456 vl.4.1, 2006.