Gert-Jan Hospers. «Beyond the Blue Banana? Structural Change in Europe's Geo-Economy» (PDF). 42nd EUROPEAN CONGRESS of the Regional Science Association Young Scientist Session - Submission for EPAINOS Award August 27-31, 2002 - Dortmund, Germany, 2002. Arxivat de l'original el 2007-09-29. [Consulta: 13 novembre 2011].
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Gert-Jan Hospers. «Beyond the Blue Banana? Structural Change in Europe's Geo-Economy» (PDF). 42nd EUROPEAN CONGRESS of the Regional Science Association Young Scientist Session - Submission for EPAINOS Award August 27-31, 2002 - Dortmund, Germany, 2002. Arxivat de l'original el 2007-09-29. [Consulta: 13 novembre 2011].