1. Bressanelli, E., Koop, C., Reh, C.: The growth of informal EU decision-making has empowered centrist parties (2016). https://blogs.lse.ac.uk/europpblog/2016/02/10/the-growth-of-informal-eu-decision-making-has-empowered-centrist-parties/
2. Butler, I.: Non-governmental organisation participation in the EU law-making process: the example of Social Non-Governmental Organisations at the Commission, Parliament and Council. Europ. Law J. 14(5), 558–582 (2008). https://doi.org/10.1111/j.1468-0386.2008.00430.x
3. Carnegie Europe. Where in the world is the EU now? (2020). https://carnegieeurope.eu/2020/04/29/where-in-world-is-eu-now-pub-81658
4. Chambers, A.: The Lobbying of the EU. How to achieve greater transparency. Civitas: Institute for the Study of Civil Society, UK (2016) https://www.civitas.org.uk/content/files/Anthony-Chambers-EU-lobbying.pdf
5. Corporate Europe Observatory (CEO). Writing the Script: The European Roundtable of Industrialists (2003). https://corporateeurope.org/sites/default/files/europe_inc_ch_3.pdf