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van Welsum, D. (2004) In search of 'Offshoring': evidence from U.S. imports of services. Working Paper. Birkbeck, University of London, London, UK.
van Welsum, D. (2003) Foreign direct investment and exports of services. Working Paper. Birkbeck, University of London, London, UK.
van Welsum, D. (2003) International trade in services: issues and concepts. Working Paper. Birkbeck, University of London, London, UK.