1. US Const, Art I, §8, cl 8.
2. Government Patent Policy Act of 1980, Pub L No. 96-517, 94 Stat 3015 (1980).
3. Jaffe AB, Lerner J. Innovation and Its Discontents. Princeton, NJ: Princeton University Press; 2004.
4. National Bureau of Economic Research Working Paper;WM Cohen,2000
5. National Bureau of Economic Research. The NBER US Patent Citations Data File. Available at: http://www.nber.org/patents. Accessed March 15, 2007.