Cadot, Olivier, Lars-Hendrik Röller and Andreas Stephan (2002) 'Contribution to Productivity or Pork Barrel? The Two Faces of Infrastructure Investment', WZB discussion papers FS IV 02-09.
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Cadot, O., Röller, L. H., Stephan, A. (2002). 'Contribution to Productivity or Pork Barrel? The Two Faces of Infrastructure Investment'. WZB discussion papers FS, pp. 2-9.
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