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2. Altemeier, W. A., Burke, J. F., Pruitt, B. A. and Sandusky, W. R. (1976), Manual on Control of Infection in Surgical Patients. Lipincott, Philadelphia.
3. Ayliffe, G. A. J., Babb, J. R., Collins, B. J. and Lowbury, E. J. L. (1969), Transfer areas and clean zones in operating suites. J. Hygiene, 67, 417.
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5. British Standards, BS 3970 Part 3, BSI (in draft).