6FONTANA R,GEUNA A, MATT M. Factors affectinguniversity-industry R&-D projects : the importance ofsearching, screening and signaling [J]. Research Policy,2006, 35(2): 309 -323.
7ETZKOWITZ H,LEYDESDORFF L. The triple helix ofuniversity-industry-government relations; a laboratory forknowledge-based economic development [ J ]. EASST Re-view,1995,14(1) :14-19.
8LETTL C, HERSTATT C, GEMUENDEN H G. Users'contributions to radical innovation: evidence from four ca-ses in the field of medical equipment technology [J]. R&-DManagement,2006 , 36(3):251-272.
9LILIEN G L, MORRISON P D’SEARLS K. Performanceassessment of the lead user ider-generation process for newproduct development [J]. Management Science,2002,48(8): 1 042-1 059.
10FRANKE N,PILLER F. Value creation by toolkits for us-er innovation and design: the case of the watch market[J], Journal of Product Innovation, 2004,21(6): 401-415.