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2. P. J. Fordham, et al., Food Additives and Contaminants, 1995, in press.
3. D. Thompson, S. J. Parry, R. Benzing, J. Radioanal., Nucl. Chem., 195 (1995) 209.
4. R. Ashby, Food Additives Contaminants, 5 (1988) No. 1, 484.
5. F. W. Billmeyer, Textbook of Polymer Science, 3rd ed. Wiley, 1984.