1. G.F. Zhang, J. Rare Earths 2, 50 (2005).
2. Z.M. Yin, Q.L. Pan, and F. Jiang, Scandium and Scandium Alloy (Changsha: Central South University Press, 2007), p. 7. (In Chinese).
3. H.C. Lin, Res. Metall. Mater. 34, 7 (2008).
4. Z.H. Zhang and G.F. Zhang, Multipurp. Util. Miner. Resour. 06, 03 (2006).
5. G.H. Li, Q. Ye, and B. Deng, Hydrometallurgy 176, 63 (2018).