1. D. E. James, H. M A. Jansen and J. B. Opschoor, Economic Approaches to Environmental Problems Amsterdam, 1978, p. 216. Governmental statement: Instruments of environmental policy, D, Second chamber of Parliament, Assembly-year 1974–1975, pp. 142–143.
2. Explanatory Memorandum to the Pollution of Surface Waters Act, D, Second chamber of Parliament, Assembly-year 1964–65, pp. 11–12.
3. Hans Bressers, “Policy Analysis and Development of Water Quality Policy,” D, in Bestuurswetenschappen 1979 (3), pp. 70–82.
4. See for instance, A. Myrick Freeman HI, Robert H. Haveman, and Allen V. Kneese, The Economics of Environmental Policy (New York, 1973), pp. 97–98, and William J. Baumol and Wallace E. Oates, “The Use of Standards and Prices for Protection of the Environment,” in Peter Bohm and Allen V. Kneese, The Economics of Environment (London, 1971 ), p. 56.
5. This happens according to tables with conversion coefficients. The tables most used are those of central governmental charges and the model of the Union of Water Authorities.