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			How trade patterns and technology flows affect productivity growth by Keller, Wolfgang Material type: Text; Format: print ; Literary form: Not fiction Publication details: Cambridge, Mass. : National Bureau of Economic Research, 1999 Availability: No items available. Save to lists Add to cart (remove)
			Environmental compliance costs and foreign direct investment inflows to U.S. states by Keller, Wolfgang Levinson, Arik Material type: Text; Format: print ; Literary form: Not fiction Publication details: Cambridge, Mass. : National Bureau of Economic Research, 1999 Availability: No items available. Save to lists Add to cart (remove)
			On theories explaining the success of the gravity equation by Evenett, Simon J Keller, Wolfgang Material type: Text; Format: print ; Literary form: Not fiction Publication details: Cambridge, Mass : National Bureau of Economic Research, 1998 Availability: No items available. Save to lists Add to cart (remove)

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