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March 2009
Working Paper N° 158
www.nbb.be/en/articles/economic-importance-air-...
December 2011
Working Paper N° 218
www.nbb.be/en/articles/economic-importance-air-...
November 2014
Working Paper N° 273
www.nbb.be/en/articles/economic-importance-air-...
July 2017
Working Paper N° 324
www.nbb.be/en/articles/economic-importance-air-...