2Baum,C.,Schaffer,M.,Stillman.,S.Instrumental Variables and GMM:Estimating and Testing[ C ],Boston College working paper,2003,545.
3Cassiman,B.,Colombo,M.,Garrone,P.,and Veugelers,R.The Impact of M&A on the R&D Process[J].An Empirical Analysis of the Role of Technological and Market Relatedness.Research Policy,forthcoming.2003.
4Lykogianni,E.Optimal Mode of Foreign Market Entry:the Effect of R&D Expenditures and Innovation Spillovers[ C ].Leuven,mimeo.2003.
2Clougherty,J.A.(2005),Industry Trade-Balance and Domestic Merger Policy:Empir-ical evidence from U.S.merger policy for manufacturing sectors,ContemporaryEconomic Policy 23.
3Guzman,A.T.(2004),The Case for International Antitrust,in:R.Epstein and M.S.