1. Art. 29 Data Protection Working Party (1 August 2003) Working Document on Biometrics. https://ec.europa.eu/justice/article-29/documentation/opinion-recommendation/files/2003/wp80_en.pdf
2. Art. 29 Data Protection Working Party (17 March 2004) Working Document on Genetic Data. https://iapp.org/media/pdf/knowledge_center/wp91_Genetic-Data_03-2004.pdf
3. Art. 29 Data Protection Working Party (15 February 2007a) Working Document on the processing of personal data relating to health in electronic health records, .https://www.dataprotection.ro/servlet/ViewDocument?id=228
4. Art. 29 Data Protection Working Party (20 June 2007b) Opinion 4/2007 on the Concept of Personal Data. https://ec.europa.eu/justice/article-29/documentation/opinion-recommendation/files/2007/wp136_en.pdf
5. Art. 29 Data Protection Working Party (20 April 2011a) Advice Paper on Special Categories of Data (“Sensitive Data”). https://www.pdpjournals.com/docs/88417.pdf