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Intra-national versus international trade in the European Union: why do national borders matter?[J] . Natalie Chen.Journal of International Economics . 2003 (1)
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National Borders, Trade and Migration[J] . John F.Helliwell.Pacific Economic Review . 2002 (3)
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Technology, trade and factor prices[J] . Paul R Krugman.Journal of International Economics . 2000 (1)
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Non-Europe: The magnitude and causes of market fragmentation in the EU[J] . Keith Head,Thierry Mayer.Weltwirtschaftliches Archiv . 2000 (2)