1. I. S. Ma, ?Organic Analysis: Fluorine?, inI. M. Kolthoff andP. J. Elving (eds.), Treatise on Analytical Chemistry, part 2, vol. 12. New York: J. Wiley. 1965. p. 117.
2. A. Steyermark, Quantitative Organic Microanalysis, 2nd Ed. New York: Academic Press. 1961. pp. 326?332.
3. T. S. Ma andJ. Gwirtsman, Analyt. Chemistry29, 140 (1957).
4. V. J. Kuznetsor, Zh. Analit. Khim.7, 226 (1952).
5. A. A. Kemodruk, Zh. Analit. Khim.19, 790 (1964).