1. Al Barazi S et al (2017) Cobalt from the DR Congo-Potential, Risks and Significance for the Global Cobalt Market. (translated, original in German), BGR, Commodity Top News v. 53, Hannover
2. Alonso E, Gregory J, Field F, Kirchain R (2007) Material availability and supply chain: risks, effects, and responses. Environ Sci Technol 41(19):6649–6656
3. Campbell G (1983) The marketing of cobalt. Nat Res Forum 7(1):81–82
4. Campbell G (1985) In: Vogely WA (ed) Theory of Metal Demand. Economics of the Mineral Industries, 4th edn. AIME, New York, pp 161–179
5. China Ministry of Land and Resources (2016) China mineral resources (2016–2020). Geological Publishing House, Beijing