International impact analysis of university journals of natural science under the background of double first-class construction: A case study of SCI and EI journals of universities in C9 League
TIAN Aiping,WEI Danmei,YANG Zuguo
Chinese Journal of Scientific and Technical Periodicals . 2019, (5): 451 -456 .  DOI: 10.11946/cjstp.201810100896