1. Figure 2.15. Differences in output shocks across countries, industries and firm size groups ("shock heterogeneity")
2. APPROPRIATING THE RETURNS FROM INDUSTRIAL RESEARCH AND DEVELOPMENT;Richard C Levin;BROOKINGS PAPERS ON ECON. ACTIVITY (SPECIAL ISSUE),1987
3. Systematic Bias in the Patent System;Alan Devlin;Depaul L. Rev., forthcoming,2011
4. See generally Michael W. Carroll, The Problem of Uniformity Cost in Intellectual Property Law;Katherine J Strandburg;AM. U. L. REV,2008