• Cabells Journalytics
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• Cambridge Structural Database
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• Chemical Abstracts Service (CAS)
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• ChronosHub
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• CiteFactor
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• CNKI Scholar
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• Google Scholar
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• Index Copernicus
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• InfoBase Index
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• J-Gate
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• QOAM
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• ResearchBib
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• Scilit
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• Semantic Scholar
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• Sherpa Romeo
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• Ulrich's Periodicals Directory
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• WorldCat
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