The Study of Patent Data Warehouse-based Technical Efficiency Map Mining Method——Taking 3D Printing Technology as an Example
Zhai Dongsheng, Cai Liwei, Zhang Jie, Feng Xiuzhen
New Technology of Library and Information Service . 2015, (7-8): 131 -138 .  DOI: 10.11925/infotech.1003-3513.2015.07.17

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