1. Attard M. T. Hollins S. McGuigan S. M. White J. 1994 Life expectancy of people with leaming disabilities
2. Cerebral Palsy: why we must plan for survival;Evans;Archives of Diseases in Childhood,1990
3. Gardner M. J. Altman D. G. 1989 Statistics with Confidence British Medical Journal
4. The life expectation of the mentally subnormal under community and hospital care;McCurley;Journal of Mental Deficiency Research,1972