1. Parfenov, E.A., Doctoral (Chem.) Dissertation, Moscow: Moscow Acad. Fine Chem. Technol., 2000, p. 48.
2. Zaprometov, M.N., Itogi Nauki Tekh., Ser.: Biol. Khim., 1988, vol. 27, p. 188.
3. Coumarin (Group 3), Chem. Abstr., 2000, no. 77, p. 193.
4. Al-Haiza, M.A. and Mostafa, M.S., Molecules, 2004, no. 8, p. 275.
5. McCarthy, P.K. and Blanchard, G.J., J. Phys. Chem., 1993, no. 97, p. 12205.