1. Bishop, E. O. and Richard, R. E.Mol. Phys., 1960,3, 114.
2. Clayton, A...Jour. Chem. Soc., 1910,97, 2106.
3. Dharmatti, S. S., Govil, G., Kanekar, C. R. and Virmani, Y. P.Bull. AMPERE, Colloque de Pise, 1960, p. 492.
4. Govil, G., Kanekar, C. R., Khetrapal, C. L. and Virmani, Y. P.Curr. Sci., 1961,30, 331.
5. Govinda Rao, M. A...Proc. Ind. Acad. Sci., 1936,4A, 695.