https://www.ipg-journal.de/regionen/europa/artikel/detail/national-oekologisches-patchwork-3976/
https://www.politico.eu/article/spain-election-outcome-explained-pedro-sanchez-alberto-nunez-feijoo-socialist-popular-party-vox/
http://www.ohchr.org/Documents/HRBodies/HRCouncil/WGTransCorp/Session3/LegallyBindingInstrumentTNCs_OBEs.pdf
https://ec.europa.eu/commission/publications/position-paper-transmitted-eu27-nuclear-materials-and-safeguard-equipment-euratom_en