Sources
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- House of Commons . 1990 . National Insurance Fund Long Term Financial Estimates: Report of the Government Actuary. , London : HMSO . HC 582
- House of Commons . 1989 . Public Expenditure on Social Security. Social Services Committee. , London : HMSO . HC 315
- Department of Social Security . 1991 . The Government's Expenditure Plans 1991–92 to 1993–94. , London : HMSO . Cm 1514
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