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Using patent analysis to establish technological position. CHANG S B. Technological Forecasting . 2012
[2]
http://baike.baidu.com/view/1315581.htm . 2011
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Exploring technology diffu-sion and classi?cation of business methods:using the patent citation network. CHANG S B,LAI K K,CHANG S M. Technological Forecasting . 2009
[4]
http://www.uspto.gov/web/patents/classification/uspc705/sched705.htm . 2011