1. European Commission (2010) Critical raw materials for the EU, report of the Ad hoc working group on defining critical raw materials.
https://ec.europa.eu/growth/tools-databases/eip-raw-materials/en/system/files/ged/79%20report-b_en.pdf
2. European Commission (2014) Report on critical raw materials for the EU, report of the Ad hoc working Group on defining critical raw materials.
https://ec.europa.eu/docsroom/documents/10010/attachments/1/translations/en/renditions/pdf
3. European Commission (2017) Study on the review of the list of critical raw materials.
https://publications.europa.eu/en/publication-detail/-/publication/08fdab5f-9766-11e7-b92d-01aa75ed71a1/language-enhttps://publications.europa.eu/en/publication-detail/-/publication/08fdab5f-9766-11e7-b92d-01aa75ed71a1/language-en
4. EuRare Project (2017) European REE market survey. Roadmap for the REE material supply autonomy in Europe.
http://www.eurare.eu/docs/T1.1.2_Report-final-280217.pdf
5. Gutfleisch O, Willard MA, Brück E et al (2011) Magnetic materials and devices for the 21st century: stronger, lighter, and more energy efficient. Adv Mater 23:821–842.
https://doi.org/10.1002/adma.201002180