1. ASTM, Book of Standards, Part 32, Chemical Analysis of Metals, p. 269 (1964).
2. ASTM, Book of Standards, ibid., p. 525 and p. 548.
3. British Standards Institution, British Standard 3727, Parts 4, 5, 6, 7, 8 and 10, Methods for the Analysis of Nickel for Use in Electronic Tubes and Valves.
4. Determination of Traces of Boron in Nickel
5. Photometric Determination of Chromium in Electronic Nickel