4Holbrook A D.Why measure science[J].Science and Public Policy,1992,19(5):36-48.
5Anselin L,Varga A,Acs Z.Local geographic spillovers between university research and high technology innovations[J].Journal of Urban Economics,1997,(42):422-448.
6Varga A.Local academic knowledge spillovers and concent ration of economic activity[J].Journal of Regional Science,2000,(40):289-309.
7Fischer W,Varga A.Production of knowledge and geographically mediated spillovers from universities international[J].Journal of Technology Management,2001,22(4):23-34.
8Griliches Z.Issues in assessing the contribution of R&D to productivity growth[J].Journal of Economics,1979,(10):92-116.
9Jaffe A B.Real effects of academic research[J].American Economic Review,1989,79 (5):957-970.
10Romer P M.Endogenous technological change[J].Journal of Political Economy,1990,98(5):71-102.
