1. Devyatykh, G.G., Karpov, Yu.A., and Osipova, L.I., Vystavka-kollektsiya veshchestv osoboi chistoty (Exhibition-Collection of Extrapure Substances), Moscow: Nauka, 2003.
2. Devyatykh, G.G., Kovalev, I.D., Krylov, V.A., et al., Reliability and Completeness of Data on the Impurity Composition of High-Purity Volatile Compounds, Neorg. Mater., 2001, vol. 37, no. 3, pp. 371–375.
3. ZAO Promkhimperm’, http://www.promshim.com .
4. http://www.heraeus-quarzglas.com/en/quarzglas/chemicalpurity/Chemical-purity.aspx .
5. Alfa Aesar® A Johnson Matthey Company. Catalogue “Research Chemicals, Metals and Materials 2008–09”.