1. Quick reference: Analysis of Elemental Impurities in Certified Pharmaceuticals Laboratories [in Russian], Agilent Technologies; [online resource], https: // www.campilab.by / file / 1145991 – 0436ru.pdf / 5991 – 0436RU.pdf.
2. N. E. Kuz'mina, V. M. Shchukin, E. Yu. Severinova, et al., Khim.-Farm. Zh., 49(7), 52 - 56 (2015)
3. Pharm. Chem. J., 49(7), 490 - 494 (2015).
4. A. V. Skal’nyi and I. A. Rudakov, Bioelements in Medicine [in Russian], Mir, Moscow (2004).
5. N. E. Kuz’menko and S. S. Churanov, Obshch. Neorganich. Khim., Moscow State University, Moscow (1977).