Rychkov, Vladimir, Pertti Koukkari, Sergey Kirillov, and Evgenii Kirillov. “Best Practices of Russia and Finland in Extracting REE from Fertilizer Waste”. KnE Materials Science 2, no. 2 (September 3, 2017): 168-173. Accessed May 19, 2024. https://knepublishing.com/index.php/KnE-Materials/article/view/965.