References
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- TNO-CHO, 1986: Water in The Netherlands. — TNO Committee on Hydrological Research, The Hague, Proc. & Information no. 37.
- UNESCO, 1984: Hydro-environmental indices: A review and evaluation of their use in the assessment of the environmental impacts of water projects. — IHP-II Project A 3.2, Techn. Document in Hydrology. Paris.