1. Council of the European Union. Regulation (EU) 2016/679 of the European Parliament and of the Council on the protection of natural persons with regard to the processing of personal data and on the free movement of such data, and repealing Directive 95/46/EC (General Data Protection Regulation) (2016).
http://data.consilium.europa.eu/doc/document/ST-5419-2016-INIT/en/pdf
2. EU Commission. Regulation (EU) No 910/2014 of the European Parliament and of the Council of 23 July 2014 on electronic identification and trust services for electronic transactions in the internal market and repealing Directive 1999/93/EC, OJ L 257, 28 August 2014, p. 73–114 (2012).
http://eur-lex.europa.eu/legal-content/EN/TXT/?uri=uriserv:OJ.L_.2014.257.01.0073.01.ENG
3. Chaum, D.: Security without identification: transaction systems to make big brother obsolete. Commun. ACM 28(10), 1030–1044 (1985)
4. Benenson, Z., Girard, A., Krontiris, I.: User acceptance factors for anonymous credentials: an empirical investigation. In: Proceedings of the Workshop on the Economics of Information Security (WEIS) (2015)
5. Microsoft research. U-Prove (2013)
http://research.microsoft.com/en-us/projects/u-prove/