1. Bertin, J. (1983) Sémiologie Graphique: Les diagrammes, les réseaux, les cartes” Paris: Gauthier-Villars.
2. Map of Critical Raw Material Deposits in Europe
3. COM(2008) 699 final (2008) “Communication From The Commission To The European Parliament And The Council: The Raw Materials Initiative — Meeting Our Critical Needs for Growth and Jobs in Europe”.
4. COM/2011/0025 final (2011) “Communication from The Commission To The European Parliament, The Council, The European Economic And Social Committee And The Committee Of The Regions: Tackling the Challenges in Commodity Markets and on Raw Materials”.
5. COM/2014/0297 final (2014) “Communication from The Commission To The European Parliament, The Council, The European Economic And Social Committee and The Committee Of The Regions: On the Review of the List of Critical Raw Materials for the EU and the Implementation of the Raw Materials Initiative”.