2HAUPT R.Patent analysis of a company's technology strength[M].Cactus,2005:229-249.
3NESTA L,PATEL P.National patterns of technology accumulation:use of patent statistics[M].Handbook of quantitative science and technology research:the use of publication and patent statistics in studies on R&D systems,2004:1200-1212.
4BACHMANN A.Profiles of corporate technological capabilities--a comparison of large british and German pharmaceutical companies[J].Technovation,1998,18(10):593-604.