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Griffith, Rachel, Redding, Stephen and Simpson, Helen (2004) Foreign Ownership and Productivity: New Evidence from the Service Sector and the R&D Lab. . London School of Economics and Political Science. Centre for Economic Performance, London, UK.
Bernard, Andrew B., Redding, Stephen, Schott, Peter K. and Simpson, Helen (2004) Relative wage variation and industry location. . London School of Economics and Political Science. Centre for Economic Performance, London, UK.
Bernard, Andrew B., Redding, Stephen, Schott, Peter K. and Simpson, Helen (2003) All is not equal. Centrepiece, 8 (2). pp. 2-7. ISSN 1362-3761
Griffith, Rachel, Redding, Stephen and Simpson, Helen (2003) Productivity convergence and foreign ownership at the establishment level. . London School of Economics and Political Science. Centre for Economic Performance, London, UK.
Quah, Danny and Simpson, Helen (2003) Spatial cluster empirics. . London School of Economics and Political Science, London.
Bernard, Andrew B., Redding, Stephen, Schott, Peter K. and Simpson, Helen (2002) Factor price equalization in the UK? . London School of Economics and Political Science. Centre for Economic Performance, London, UK.