1. S. V. Emshanova and S. A. Minina, Khim.-Farm. Zh., 24(8), 67–69 (1990).
2. M. D. Mashkovskii, Drugs [in Russian], Novaya Volna, Moscow (2002), Vol. 1, p. 170.
3. Drug Technology and Standardization (A Collection of Scientific Papers) [in Russian], V. P. Georgievskii and F. A. Konev (ed.), Rireg, Kharkov (1996).
4. USSR State Pharmacopoeia, XI Ed. [in Russian], Meditsina, Moscow (1987), Vol. 2, pp. 154–160.
5. M. L. Ezerskii, Khim.-Farm. Zh., 11(8), 98–114 (1977).