Tang, Kai, Arjan Ciftja, Casper van der Eijk, Shawn Wilson, and Gabriella Tranell. 2013. “Recycling of the Rare Earth Oxides from Spent Rechargeable Batteries Using Waste Metallurgical Slags”. Journal of Mining and Metallurgy, Section B: Metallurgy 49 (2), 233. https://aseestant.ceon.rs/index.php/jmm/article/view/2371.