5Jahanshahloo, GR. , Lotfi, F. H. , Shoja, N. , To- hidi, G, Razavyan, S. , Undesirable inputs and outPuts in DEA models. APPlied Mathematies and ComPutation,2005,169:917 -925.
6Seiofrd, L. M. , Zhu, J. , A resPonse to comments on modeling undesirable factors in effieiency e- valuation. EuroPean Jounral of Operational Re- search ,2005,161:579 - 581.
7Veugelers R, Cassiman B. R&D Cooperation be- tween firms and universities ; some empirical ev- idente from belgian manufacturing [ J ]. Interna- tional Journal of Industrial Organization, 2005 (23) :355 - 379.
8Fotopoulos G. European Union regional productivity dynamics: A "Distributional" approach [J]. Journal of Regional Science, 2008,48(2): 419 - 454.
9Poon J P H. Thompson E R. Convergence or differentiation? American and Japanese transnational corporations in the Asia Pacific [ J ]. Geoforum, 2004,35 : 111 - 125.
10Bradshaw M J, Vartapetov K. A new perspective on regional in- equalities in Russia [J]. Eurasian Geography and Economics, 2003,44(6): 403 - 429.
