摘要：Recently, Zhang et al. [1] published the paper entitled"Mapping of hexavalent chromium removal research:A bibliometric analysis of research outputs from 1975 to 2012".In 2.DATA SOURCES AND METHODOLOGY. authors mentioned that"Documents used in this study were based on the online database of the Science Citation Index(SCI),retrieved from the ISI Web of Science. Philadelphia. USA."which is the same from an earlier article entitled"Assessment of world aerosol research trends by bibliometric analysis"[2]. There is no more ISI Web of Science but Thomson Reuters Web of Science only,Authors also noticed that"According to Joumnal Citation Reports (JCR), it indexed 8411 major journals with citation references across 186 scientific disciplines in 2013."In fact, there were 8539 journals in Science Citation Index Expanded across 176 Web of Science categories in 2013.In addition, the most parts of"2.DATA SOURCES AND METHODOLOGY"copied from"A review of published wetland research,1991-2008: Ecological engineering and ecosystem restoration"[3] and"Trends in research on global climate change: A Science Citation Index Expanded-based analysis"[4].
