1. Topics in Current Chemistry: Non-Aqueous Chemistry (Springer, Heidelberg, Berlin, New York, 1972), Vol. 27.
2. J. J. Lagowski, The Chemistry of Non-Aqueous Solvents (Academic Press, New York, 1967), Vol. IV.
3. Sandeep Kumar, D. R. Sharma, N. Thakur, V. S. Rangra, and N. S. Negi, Z. Phys. Chem. 219, 1431 (2005).
4. N. Thakur and D. R. Sharma, Ind. J. Pure Appl. Phys. 38, 328 (2000).
5. A. D. Vyad and V. A. Rana, Ind. J. Pure Appl. Phys. 40, 69 (2002).