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 27–31 August 2002. Dortmund, Germany. 2002 [2006-09-27]. (原始内容(PDF)存档于2020-03-18).
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 27–31 August 2002. Dortmund, Germany. 2002 [2006-09-27]. (原始内容(PDF)存档于2020-03-18).