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Johnson, G. and Layard, Richard (1986) The natural rate of unemployment: explanation and policy. In: Ashenfelter, O. and Layard, Richard, (eds.) Handbook of Labor Economics. Elsevier (Firm), Amsterdam, Netherlands. ISBN 0444878580
Johnson, G. and Layard, Richard (1982) Efficient public employment with labour market distortions. In: Haveman, Robert H., (ed.) Public Finance and Public Employment. Wayne State University. Press, Detroit, USA. ISBN 081431712X