1. Patnaik, A. K., Nayak, P. L. and Rout, M. K.Ind. J. Chem., 1970,8, 722;
2. Satpathy, K. K., Patnaik, A. K., Nayak, P. L. and Rout, M. K.J. Ind. Chem. Soc., 1971,48, 847;
3. Nayak, P. L. and Rout, M. K.Ibid., 1971,63, 32.
4. Meyer, R. J. and Goldschmidt, E.Ber., 1903,36, 238.
5. Hecker, E. and Lattrett, R.Ann., 1963, p. 48.