4Aghion, Philippe, Nicholas Bloom, Richard Blundell, Rachel Griffith, and Peter Howitt, 2005,“Competition and Innovation: An Inverted U Relationship”, Quarterly Journal of Economics, 20(2), pp.701-728.
5Athey, S. and G. Imbens, 2006, "Identification and Inference on Nonlinear Difference-in-Differences Models", Econometrica, 74, pp.431-497.
6Averch, Harvey and Leland L. Johnson, 1962, "Behaviour of the Firm under Regulatory Constraint", American Economic Review, 52(5), pp.1052-1069.
7Bertrand, Marianne, Esther Duflo and Sendhil Mullainathan, 2004, "How Much Should We Trust Differences-in- Differences Estimates?", Quarterly Journal of Economics,119(1), pp.249-75.
8Di Tella, Rafael and Ernesto Schargrodsky, 2004, "Do Police Reduce Crime? Estimates Using the Allocation of Police Forces after a Terrorist Attack", American Economic Review, 94 (1), pp.115-133.
9Eissa, Nada O., 1995, “Taxation and Labor Supply of Married Women: The Tax Reform Act of 1986 as a Natural Experiment”, NBER Working Paper No. W5023.
10Feldstein, Martin, 1995, “The Effect of Marginal Tax Rates on Taxable Income: A Panel Study of the 1986 Tax Reform Act”, Journal of Political Economy, 103(3), pp.551-572.
