T. H. Nguyen, T. T. Tran, P. D. Nguyen, and M. S. Lee, “A green approach to recovering lithium and cobalt from spent lithium-ion batteries using dilute HCl solution mixed with H. sabdariffa flower extract as a leaching agent”, J Min & Metal B Metallurgy, vol. 60, no. 2, pp. 215-225, Nov. 2024.