1. H. Weisz, Microanalysis by the Ring Oven Technique. Oxford: Pergamon Press. 1961.
2. F. R. Haba andG. L. Wilson, Proceedings of the Feigl Anniversary Symposium, Birmingham, 1962. Amsterdam: Elsevier. In the press.
3. F. R. Haba andC. L. Wilson, Talanta,9, 841 (1962).
4. F. Feigl, Spot Tests in Inorganic Analysis. Amsterdam: Elsevier. 1958. p. 269.
5. F. P. Treadwell andW. T. Hall, Analytical Chemistry, Vol. I. New York: Wiley. 1937. pp. 336, 337.