1. G. MASTINU, (private communication).
2. W. SLAVIN, Atomic Absorption Spectroscopy, Wiley, New York, 1968.
3. Water analysis by atomic absorption, Varian Techtron Manual.
4. E. N. JENKINS, A. A. SMALES, Quart. Rev., 10 (1956) 83.
5. B. A. LOVERIDGE, A. A. SMALES, in Methods of Biochemical Analysis, (Ed. D. GLICK) Interscience, 1957.