1. Patsanovskii, I.I., Ishmaeva, E.A., Sundukova, E.N., Yarkevich, A.N., and Tsvetkov, E.N., Zh. Obshch. Khim., 1986, vol. 56, no. 3, p. 567.
2. Tkachenko, S.E., Yarkevich, A.N., Timofeev, S.V., and Tsvetkov, E.N., Zh. Obshch. Khim., 1988, vol. 58, no. 3, p. 531.
3. Tkachenko, S.E., Yarkevich, A.N., Tsvetkov, E.N., Galkin, V.I., Sayakhov, R.D., Cherkasov, R.A., and Pudovik, A.N., Dokl. Akad. Nauk SSSR, 1990, vol. 315, no. 3, p. 628.
4. Tsvetkov, E.N., Bondarenko, N.A., Malakhova, I.G., and Kabachnik, M.I., Zh. Obshch. Khim., 1985, vol. 55, no. 5, p. 11.
5. Bondarenko, N.A., Yarkevich, A.N., Bovin, A.N., and Tsvetkov, E.N., Izv. Akad. Nauk, Ser. Khim., 1991, no. 8, p. 1933.