1. Art. 29 WP 55 (2002). Working document on the surveillance of electronic communications in the workplace (No. 5401/01/EN/Final). Brussels, Belgium: Article 29 Data Protection Working Party, European Commission, Directorate General Justice.
2. Art. 29 WP 203 (2013). Opinion 03/2013 on purpose limitation (No. 00569/13/EN). Brussels, Belgium: Article 29 Data Protection Working Party, European Commission, Directorate General Justice.
3. Art. 29 WP 215 (2014). Opinion 04/2014 on surveillance of electronic communications for intelligence and national security purposes (No. 819/14/EN WP 215). Brussels, Belgium: Article 29 Data Protection Working Party, European Commission, Directorate General Justice.
4. Art. 29 WP 216 (2014). Opinion 05/2014 on anonymization techniques (No. 0829/14/EN). Brussels, Belgium: Article 29 Data Protection Working Party, European Commission, Directorate General Justice.
5. Art. 29 WP 221 (2014). Statement on Statement of the WP29 on the impact of the development of big data on the protection of individuals with regard to the processing of their personal data in the EU (No. 14/EN WP 221). Brussels, Belgium: Article 29 Data Protection Working Party, European Commission, Directorate General Justice.