1. Remennikov, G.Ya., Doctoral (Chem.) Dissertation, Kiev, 1998.
2. Drach, B.S., Brovarets, V.S., and Smolii, O.B., Azotistye geterotsykly i alkaloidy (Nitrogen-containing Heterocycles and Alkaloids), Kartsev, V.G., Moscow: Iridium, 2001, vol. 1, p. 69.
3. Slivchuk, S.R., Brovarets, B.S., and Drach, B.S., Dokl. Nat. Akad. Nauk Ukrainy, 2006, no. 3, p. 146.
4. Nepluev, V.M. and Sinenko, T.A., Zh. Org. Khim., 1978, vol. 14, no. 9, p. 1953.
5. Atkinson, M.R., Shaw, G., and Sugowdz, G., J. Chem. Soc., 1957, vol. 7, p. 3207.