OECD (2003),
International Trade by Commodity Statistics: Portugal, Turkey, OECD TOTAL, NAFTA, OECD ASIA PACIFIC, OECD EUROPE, EU-15 1996/2001 Volume 2002 Issue 5,
OECD Publishing, Paris,
https://doi.org/10.1787/itcs-v2002-5-en-fr.
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