6Acemoglu,Daron.Training and Innovation in an Imperfect Labor Market[J]. Review of Economic Studies, 1997,64:445-464.
7Acemoglu,Daron & Pischke Jōrn-Steffen.Why do Firms Train? Theory mad Evidence[J]. Journal of Economics, 1998,113:79-119
8Acemoglu, Daron & Pischke Jōrn-Steffen. the Structure of Wages and Investment in Ceneral Training[J]. Journal of Political Economy, 1998,107: 538--572.