1. Abraham, K.G., (1983). Structural/Frictional vs. Deficient Demand Unemployment: Some New Evidence. American Economic Review, 73:708–724.
2. Abraham, K.G., (1987). Help-Wanted Advertising, Job Vacancies, and Unemployment. Brookings Papers on Economic Activity, 1/87:207–243.
3. Blanchard, O.J. and P. Diamond, (1989). The Beveridge Curve. Brookings Papers on Economic Activity, 1/89:1–76.
4. Budd, A., P. Levine and P. Smith, (1987). Long-term Unemployment and the Shifting U-V Curve. A Multi-Country Study. European Economic Review, 31:296–305.
5. Burda, M.C., (1988). Is There a Capital Shortage in Europe? Weltwirtschaftliches Archiv, 124:38–57.