联合专利分类体系研究

廖佳佳;高菲;吕良

Research on Cooperative Patent Classification System

Liao Jiajia;Gao Fei;Lyu Liang

Journal of Modern Information . 2014, (1): 64 -68 . DOI: 10.3969/j.issn.1008-0821.2014.01.015