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4. (a) Hofmeister, F.: Zur Lehre von der Wirkung der Saize. Arch. Exp. Pathol. Pharmakol. 24, 247–269 (1888);
5. (b) Frausto da Silva, J.J.R., Williams, R.J.P.: The Biological Chemistry of the Elements. Clarendon Press, Oxford (1991)