1. 32. Federal Register, (4) (19) (67) 6144.
2. A. K. Amigahed andM. I. Blake, J. Pharm. Sci., 5 (1970) 16.
3. C. Massatch, Pharm. Ztg., 85 (1949) 222.
4. E. G. Whittle, Analyst, 69 (1944) 45.
5. A.Gaudione, F.Toffoli and L.Benedetto, Chem. Zentr., 129 (1958).