Hans-Werner Sinn
in: M. Neumann und Karl Roskamp, eds., Public Finance and Performance of Enterprises, 34th Annual Congress and Semicentennial of the International Institute of Public Finance, Paris, 24th - 28th August 1987, Paris 1987, Wayne State University Press: Detroit 1989, pp. 153-176; NBER Working Paper Nr. 1448, September 1990.