1. Nickel Institute, https://nickelinstitute.org/
2. Cobalt Market Report (2021) Cobalt Institute, https://www.cobaltinstitute.org/wp-content/uploads/2022/05/FINAL_Cobalt-Market-Report-2021_Cobalt-Institute-3.pdf
3. Donegan S (2006) Direct solvent extraction of nickel at Bulong operations. Miner Eng 19:1234–1245
4. Nickel_Sulphate_Battery(coremaxcorp.com)
5. Cobalt_ Sulphate_Battery (coremaxcorp.com)