中国科学院数学与系统科学研究院期刊网
Product heterogeneous effects of economic policy uncertainty on imports: Big data context analysis based on Chinese newspapers
LI Bing, LIN Anqi, GUO Dongmei
Systems Engineering - Theory & Practice . 2020, (6): 1578 -1595 .  DOI: 10.12011/1000-6788-2020-0439-18