1. G. A. Tolstikov, L. A. Baltina, V. P. Grankina, et al., Licorice: Biodiversity, Chemistry, and Use in Medicine [in Russian], Geo Academic Press, Novosibirsk (2007).
2. G. A. Tolstikov, L. A. Baltina, É. É. Schul’ts, and A. G. Pokrovskii, Bioorgan. Khim., 23, 691–709 (1997).
3. R. Pompei, O. Flore, M. Marcialis, A. Pani, B. Loddo, Nature, 281, 689–690 (1979).
4. M. Baba, Sh. Shigeta, Antiviral Res., 7, 99–107 (1987).
5. T. Okamoto, K. Kojino, O. Hino, Jpn. J. Pharmacol., 87, 177–180 (2001).