1. Abel, P. I. (1973). In: Free Radicals, Vol. 2, J. K. Kochi (ed.), John Wiley & Sons, New York, p. 63.
2. Abel, E. W., Pratt, J. M., Whelan, R. and Wilkinson, P. J. (1974). J. Am. Chem. Soc., 96, 7119.
3. Adrian, J. (1974). World Rev. Nutr. Diet., 19, 71.
4. Allan, W. A. and Wood, H. L. (1970). J. Sci. Food Agric., 21, 282.
5. Anderson, R. F. (1981). In: Oxygen and Oxy-Radicals in Chemistry and Biology, M.A.J. Rodgers and E. L. Powers (eds), Academic Press, New York, p. 597.