情报学报  2020, Vol. 39 Issue (4): 345-356    DOI: 10.3772/j.issn.1000-0135.2020.04.001
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Construction of Information System Oriented to Identifying the Frontier of Science and Technology in Key Areas
Liu Qiyan, Zeng Wen, Che Yao
Institute of Scientific and Technical Information of China, Beijing 100038