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SCOPUS, INSPEC, Google Scholar, CAB International, Academic OneFile, CAB Abstracts, CNKI, EBSCO Environment Complete, EBSCO Environment Index, Expanded Academic, INIS Atomindex, OCLC, ProQuest ABI/INFORM, ProQuest  Agricultural & Environmental Science Database, ProQuest Business Premium Collection, Proquest Central, ProQuest Science Database, ProQuest SciTech Premium Collection, SCImago, Summon by ProQuest.