1. Feigl F 1958Spot Tests in Inorganic Analysis (Elsevier) 5th ed. pp. 327–330
2. Loach K W 1961J. Chromatogr.
6 367
3. Pearson D 1970Chemical Analysis of Foods (London: J and A Churchill) 6th ed. 39 377
4. Remy H 1956Treatise on Inorganic Chemistry (Elsevier) Vol. I p. 595
5. Rutter L 1948Nature
161 435