1. Balaan, M.R., and Banks, D.E. (1998) Silicosis. In: Rom, W.N. (ed.) pp. 435–448. Environmental and Occupational Medicine. Third ed. Lippincott-Raven, Philadelphia.
2. Becker, R.P., and Geoffroy, J.S. (1981) Backscattered electron imaging for the life sciences: introduction and index to applications. Scan. Electron Microscop. 4, 195–206.
3. Blount, B.W. (1990) Two types of metal fume fever: mild vs. serious. Mil. Med. 155, 372–377.
4. Chaffey, CM., and Bowie, C. (1994) Radon and health-an update. J. Publ. Health Med. 16, 465–470.
5. Chan-Yeung, M., and Malo, J.L. (1995) Occupational asthma. N. Engl. J. Med. 333, 107–112.