Zhao, Y., Y. Wang, J. Wu, and W. Ma. “Study on the Behavior of Impurity Removal from Lithium Iron Phosphate Slag Using the Ultrasonic-Assisted Sulphuric Acid Leaching”. Journal of Mining and Metallurgy, Section B: Metallurgy, Vol. 60, no. 1, Feb. 2024, pp. 59-70, https://aseestant.ceon.rs/index.php/jmm/article/view/45914.