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Esbjerg: University of Southern Denmark, Department of Environmental and Business Economics (IME), 2003
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Bochum: Lehrstuhl für Produktionswirtschaft, Ruhr-Universität Bochum, [2016]
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Washington, DC: World Bank, 2012
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London: printed by H. Reynell, No. 21, Piccadilly. And sold by J. Debrett, opposite Burlington-House, Piccadilly, M DCC LXXXIX. [1789] ; Online-Ausg.: Farmington Hills, Mich: Cengage Gale, 2009
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Geneve: International Organization for Standardization, 2008