1. Buhl, R., Meyer, A. and Volgelmeier, C. (1996) Oxidant-Protease interaction in the lung prospects for antioxidant therapy. Chest. 110, 267S-272S.
2. Vallyathan, V. and Xialnglin, S. (1997) The role of oxygen free radicals in occupational and environmental lung diseases. Environ Health Prespect. 105, 165–177.
3. Cross, C.E., Vander, V.A. and O'Neil, C. (1994) Oxidant, antioxidant and respiratory tract lining fluid. Environ Health Perspect. 102, 185–191.
4. Halliwell, B., Gutteridge, J. and Cross, C.E. (1992) Free radicals antioxidants and human disease: where are we now? J. Clin Lab Med. 119, 598–620.
5. Varley, Gowenlock and Bell (1991) Practical clinical biochemistry, Vol.2. Hormones, vitamins, drugs and poisons. 5th edn. 1st Indian reprint,. William Heinemann Medical Books Limited, p 253–255.