1. CEN CWA 16703-1, Business Interoperability Interfaces for Public Procurement in Europe - Part 1: Profile Overview. January 2010.
2. Commission of the European Communities, Proposal for a Regulation on Electronic Identification and Trust Services for Electronic Transactions in the Internal Market, COM(2012) 238/2, June 2012.
3. Study on Cross-Border Interoperability of eSignatures (CROBIES), Guidelines and Guidance for Cross-border and Interoperable Implementation of Electronic Signatures. CROBIES deliverable 5.1, July 2010.
4. ISA programme, European Interoperability Framework for European Public Services, v2.0, December 2010.
5. ETSI SR 001 604 v1.1.1 (2012-07). Rationalised Framework for Electronic Signature Standardisation.