Coe, D., & Hoffmaister, W. (1999). Are There International R and D Spillovers Among Randomly Matched Trade Partners?: A Response to Keller. International Monetary Fund.

Coe, David, and Willy Hoffmaister. Are There International R and D Spillovers Among Randomly Matched Trade Partners?: A Response to Keller. Washington, D.C.: International Monetary Fund, 1999.

Coe, David, and Willy Hoffmaister. Are There International R and D Spillovers Among Randomly Matched Trade Partners?: A Response to Keller. International Monetary Fund, 1999.