1. Okabe, T.H., Ouchi, T.: Recycling of critical metals, Minerals, Metals and Materials Series. Springer, pp. 237–243 (2019)
2. Jowitt, S.M., Mudd, G.M., Thompson, J.F.H.: Future availability of non-renewable metal resources and the influence of environmental, social, and governance conflicts on metal production. Commun. Earth Environ. 13, 1–8 (2020)
3. Blengini, G.A., Latunussa, C.E.L., Eynard, U., Torres de Matos, C., Wittmer, D., Georgitzikis, K., Pavel, C., Carrara, S., Mancini, L., Unguru, M., Blagoeva, D., Mathieux, F., Pennington, D.: Study on the EU's list of Critical Raw Materials (2020) Final report. Publications office of the European Union, pp. 1–153 (2020)
4. Ganguli, R., Cook, D.R.: Rare earths: a review of the landscape. MRS Energy Sustain. 5, 1–16 (2018)
5. King, C.J., Navratil, J.D. (eds.): Chemical separations, vol. 1. Principles. Litarvan literature, Denver (1986)