1. EU Directive 1999/93/EC of the European Parliament and the Council of 13 December 1999 on a Community framework for Electronic Signatures (December 1999)
2. ETSI TS 101 862 v. 1.3.2: Qualified Certificate Profile (June 2004)
3. Santesson, S., Nystrom, M., Polk, T.: Internet X.509 Public Key Infrastructure: Qualified Certificates Profile, IETF RFC 3739 (March 2004)
4. CEN/CWA 14890-1, Application Interface for smart cards used as Secure Signature Creation Devices - Part 1 - Basic requirements (2004)
5. CEN/CWA 14890-2:2004; Application Interface for smart cards used as Secure Signature Creation Devices - Part 2 - Optional Features (2004)