1. Rao, P. S., Beri, R. M. and Budhiraja, R. P...J. Sci. and Ind. Res., 1951,10 B, 261.
2. Norman, A. G...Biochem. J., 1937,31, 1579.
3. Norris, F. W. and Preece, I. A...Ibid., 193024, 59.
4. Rao, P. S...Science and Culture, 1951,17, 90.
5. Rao, P. S. and Budhiraja, R. P...J. Sci. and Ind. Res., 1952,11B, 209.