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4. Home Office and Department of Health and Social Security (1975) Report of the Committee on Mentally Abnormal Offenders (the Butler Report). Cmnd 6244. London: HMSO.
5. Lewis, C. (1990) 'Crime and its Classification'. In Bluglass, R. and Bowden, P. (eds) Principles and Practice of Forensic Psychiatry. Edinburgh: Churchill Livingstone, pp. 119-28.