Boyd, J. & Banzhaf, S. 2007. What are ecosystem services? The need for standardized environmental accounting units. Ecological Economics63(2-3): 616-626.
Costanza, R.; D’Arge, R.; DeGroot, R.; Farber, S.; Grasso, M.; Hannon, B.; Limburg, K.; Naeem, S.; O’Neill, R.; Paruelo, J.; Raskin, R.; Sutton, P. & M. van den Belt. 1997. The Value of the World’s Ecosystem Services and Natural Capital. Nature 387: 253–260.
Costanza, R. 2008. Ecosystem services: multiple classification systems are needed. Biological Conservation 141: 350-352.
Daily, G.C. 1997. Introduction: What are Ecosystem Services? In: Daily, G.C. (Ed.) Nature's Services: Societal Dependence on Natural Ecosystems. Island Press, Washington, D.C., 1-10.
DeFries, R.S.; Foley, J.A. & Asner, G.P. 2004. Land-use choices: balancing human needs and ecosystem function. Frontiers in Ecology and the Environment, 2(5), pp.249-257.
De Groot, R.S. 1992. Functions of Nature: Evaluation of Nature in Environmental Planning, Management and Decision Making. Wolters-Noordhoff, Groningen.
De Groot, R.S.; Wilson, M.A. & Boumans, R.M. 2002. A typology for the classification, description and valuation of ecosystem functions, goods and services. Ecological economics, 41(3), pp.393-408.
Ehrlich, P.R. & Ehrlich. A.H. 1981. Extinction: The Causes and Consequences of the Disappearance of Species. Random House, New York.
Fisher, B. & Turner, K. 2008. Ecosystem services: Classification for valuation. Biological Conservation 141: 1167-1169.
Fisher, B.; Turner, R.K. & Morling, P. 2009. Defining and classifying ecosystem services for decision making. Ecological Economics 68(3): 643-653.
Haines-Young, R.H. & Potschin, M.P. 2010. The links between biodiversity, ecosystem services and human well-being In: Raffaelli, D. & C. Frid (eds.): Ecosystem Ecology: a new synthesis. BES Ecological Reviews Series, CUP, Cambridge (in press).
MEA [Millennium Ecosystem Assessment]. 2005. Ecosystems and Human Well-being: Synthesis. Island Press, Washington, DC.
Wallace, K.J. 2007. Classification of ecosystem services: problems and solutions. Biological Conservation 139: 235-246.
Wallace, K.J. 2008. Ecosystem services: Multiple classifications or confusion? Biological Conservation 141: 353-354.
Westman, W.E. 1997. How much are Nature's services worth? Science, 197, 960-64.
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