1. Shashkova, I.L., Mil’vit, N.V., and Rat’ko, A.I., Zh. Prikl. Khim., 2005, vol. 78, no. 11, p. 1859.
2. Demidov, A.I., and Krasovitskaya, O.A., Zh. Prikl. Khim., 2000, vol. 73, no.10, p.1656.
3. Lur’e, Yu.Yu., Spravochnik po analiticheskoi khimii (Handbook on Analytical Chemistry), Moscow: Khimiya, 1967.
4. Shul’ga, N.V., Shashkova, I.L., and Samuskevich, V.G., Zh. Prikl. Khim., 1999, vol. 72, no. 11, p. 1852.
5. Klement, R. and Haselbeck, H., Z. Anorg. Allgem. Chem., 1964, vol. 334, nos. 1–2, p. 27.