1. Econometric Analysis of Panel Data;Baltagi,2008
2. Bessen, J., & Maskin, E. (2000) Sequential innovation, patents, and imitation, Massachusetts Institute of Technology, Department of Economics, working paper No. 00-01, 2000.
3. Does stronger intellectual property rights increase international technology transfer? Empirical evidence from U.S. firm-level panel data;Branstetter;Quarterly Journal of Economics,2006
4. Do stronger patents induce more local innovation?;Branstetter;Journal of International Economic Law,2004
5. Intellectual property rights and innovation in developing countries;Chen;Journal of Development Economics,2005