http://www.congreso.es/consti/constitucion/indice/titulos/articulos.jsp?ini=155&tipo=2
http://www.assemblee-nationale.fr/15/propositions/pion0542.asp
https://www.diw.de/documents/publikationen/73/diw_01.c.578096.de/18-7-3.pdf
https://ec.europa.eu/commission/publications/position-paper-transmitted-eu27-nuclear-materials-and-safeguard-equipment-euratom_en