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Frieda Heyting, Jan Koppen, Dieter Lenzen, Felicitas Thiel
Inbunden. Berghahn Books, Incorporated, USA, 1997.
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The Economics of Providence
Maarten Van Dijck, Jan De Maeyer, Jeffrey Tyssens, Jimmy Koppen
Häftad. Leuven University Press, 2013.
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