1. Tolstikov, G.A., Tolstikova, T.G., Shul’ts, E.E., Tolstikov, S.E., and Khvostov, M.V., Smolyanye kisloty khvoinykh Rossii. Khimiya, farmakologiya (Resin Acids from Coniferous Plants in Russia. Chemistry and Pharmacology), Novosibirsk: Geo, 2011, p. 330.
2. Vafina, G.F., Khanova, M.D., Meshcheryakova, S.A., and Bulgakov, A.K., Chem. Nat. Compd., 2019, vol. 55, p. 868. https://doi.org/10.1007/s10600-019-02835-z
3. Comprehensive Organic Chemistry, Barton, D. and Ollis, W.D., Eds., Oxford: Pergamon, 1979, vol. 3. Translated under the title Obshchaya organicheskaya khimiya, Moscow: Khimiya, 1985, vol. 6, p. 253.
4. Vafina, G.F., Uzbekov, A.R., Gabdrakhmanova, S.F., Makara, N.S., Zarudii, F.S., and Galin, F.Z., Chem. Nat. Compd., 2016, vol. 52, p. 82. https://doi.org/10.1007/s10600-016-1552-4.218.15
5. Xu, X., Song, Zh.-Q., Shang, Sh.-B., Wang, H.-X., and Rao, X.-P., Acta Crystallogr., Sect. E, 2009, vol. 65, p. o2443. https://doi.org/10.1107/S1600536809032954