• Christian BIDARD & Guido ERREYGERS, The Potron Matrices, November 2007.

• Christian BIDARD & Guido ERREYGERS, The Classical Theory of Value and Exhaustible Resources, January 2007.

• Guido ERREYGERS, Beyond the Health Concentration Index: An Atkinson Alternative for the Measurement of the Socioeconomic Inequality of Health, University of Antwerp, Faculty of Applied Economics, Research Paper 2006-029, November 2006.

• Christian BIDARD & Guido ERREYGERS, Exhaustible Resources as a Theoretical Challenge, Paper presented at the ESHET conference “Is there progress in economics?”, Graz (Austria), 24-27 February 2000.

• Christian BIDARD & Guido ERREYGERS, The Concept of Sector, Sept. 1999, UFSIA, Department of Economics, Research Paper 99/024.

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