1. Gol’din, M. I...Compt. rend. acad. sci., U.R.S.S., 1940,26, 300–03.
2. Kozhukharov, M...Chem. Abstr., 1954,48, 11557.
3. Parthasarathi, K. and Ramaswamy, M. N.J. sci. industr., Res. (India), 1961,20 C, 273–75.
4. Roe, J. H...Methods of Biochemical Analysis, Interscience Publishers, Inc., New York, 1954,1, 120–21.
5. Chenoy, J. J., Nanda, K. K. and Garg, O. P.Physiol. Plant, 1957,10, 869–76.