1. Takaes, E., Dajka, K., Wojnarovits, L., and Emmi, S.S., Phys Chem., 2002, vol. 63, nos. 3–6, pp. 485–488.
2. Jiang Wetly, Chem. Intermediates, 2003, vol. 33, no. 2, pp. 38–39.
3. Japan Patent Appl. 61-53242.
4. US Patent 6376633.
5. US Patent 6576711.