1. L. F. Borisenko, Scandium: Main Features of Its Geochemistry, Mineralogy, and Genetic Types of Ore Deposits (Akad. Nauk SSSR, Moscow, 1961) [in Russian].
2. L. N. Komissarova, Inorganic and Analytical Chemistry of Scandium (Izd-vo URSS, Moscow, 2001) [in Russian].
3. D. A. Mineev, Lanthanides in Minerals. Statistical Studies of Relative Abundance and Distribution (Nedra, Moscow, 1969) [in Russian].
4. T. F. Veremeichik and R. V. Galiulin, “Electrons of 1 Shells of Free Atoms as a Regular System of Points on a Sphere: I. Modeling by Polyhedra,” Kristallografiya 49(5), 935–939 (2004) [Crystallogr. Rep. 49, 847–850 (2004)].
5. V. V. Ivanov, Ecological Geochemistry of Elements. Books 5 (Ekologiya, Moscow, 1997) [in Russian].