1. Gerbeleu, N.V., Doctorate (Chem.) Dissertation, Moscow, 1973.
2. Belichuk, N.I., Doctorate (Chem.) Dissertation, Kishinev, 1982.
3. Revenko, M.D., Doctorate (Chem.) Dissertation, Odessa, 1991.
4. Chumakov, Yu.M., Tsapkov, V.I., Biyushkin, V.N., Mazus, M.D., and Samus’, N.M., Kristallografiya, 1996, vol. 41, no. 5, p. 873.
5. Samus’, N.M., Tsapkov, V.I., and Gulya, A.P., Zh. Obshch. Khim., 2004, vol. 74, no. 9, p. 1539.