https://ec.europa.eu/commission/sites/beta-political/files/seminar-20200114-lpf_en.pdf
http://www.reuters.com/article/us-britain-eu-verhofstadt-idUSKBN19V0WP
https://www.parlament.cat/document/cataleg/48146.pdf
http://www.etui.org/Publications2/Books/Innovative-union-practices-in-Central-Eastern-Europe