ABSTRACT
Science, 284, 805-808 (1999). 6. R. G. Pearson, J. Am. Chem. Soc., 85, 3533-3540 (1963). 7. R. G. Pearson, Chemical Hardness, Wiley-VCH, Weinheim, 1997. 8. J. J. R. da Silva Frausto and R. J. P. Williams, The Natural Selection of the
Chemical Elements, Oxford University Press, Cambridge, UK, 1996. 9. R. Malkin and B. G. Malmstrom, Adv. Enzymol., 33, 177-244 (1970).
