1. On Patents, R&D, and the Stock Market Rate of Return;A Pakes;Journal of Political Economy,1985
2. Index of Patent Rights;W G Park;Economic Freedom of the World,2002
3. Induced Innovation and Energy Prices;D C Popp;American Economic Review,2002
4. Time in Purgatory: Determinants of the Grant Lag for U.S. Patent Applications;D C Popp;Topics in Economic Analysis and Policy,2004
5. Benefits and Costs of Intellectual Property Protection in Developing Countries;R T Rapp;Journal of World Trade,1990