1. Lecomte, J. and Freymann, R.Bull. Chem. Soc., 1941,8, 612.
2. Evans, J. C...J. Chem. Phys., 1954,22, 1228.
3. Puranik, P. G. and Venkata Ramiah, K.J. Mol. Spectroscopy, 1959,3, 486.
4. Randall, H. M., Fowler, R. G., Nelson Fuson and Dangle, J. R.Infra-red Determinations of Organic Structures, D. van Nostrand, 1949, pp. 125, 126 and 146.
5. Urazouskii, S. S. and Gunder, O. A.Dokaldy Akad. Nauk. S.S.S.R., 1953,91, 885.