1. Alm, J. (1985): “The Welfare Cost of the Underground Economy.” Economic Inquiry 26: 243–263.
2. Almon, C., Buckler, M. B., Horwitz, L.M., and Eeimbold, Th. C. (1974): Interindustry Forecasts of the American Economy. Lexington, Mass.: D.C. Heath and Company.
3. Boeschoten, W.C., and Fage, M.M.G. (1984): The Volume of Payments and the Informal Economy in the Netherlands1965–1982. Dordrecht: M. Nijhoff Publishers.
4. Breuss, F. (1982): “Potential Output und gesamtwirtschaftliche Kapazitätsauslastung.” WIFO-Monatsberichte 55: 104–118.
5. Breuss, F. (1983): Österreichs Außenwirtschaft 1945–1982. Institut für Angewandte Sozialforschung. Vienna: Signum-Verlag.