Hardianto, Ari, et al. “Impact of Leaching Operational Factors on Nickel and Manganese Recovery from Black Masses of Spent Lithium-Ion and Nickel-Metal Hydride Batteries”. Asian Journal of Chemistry, vol. 37, no. 2, Jan. 2025, pp. 385-91, doi:10.14233/ajchem.2025.33087.