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DOAJ Directory of Open Access Journals
Available from 1992.
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EBSCOhost Academic Search Ultimate
Available from 01/01/1998.
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Elsevier ScienceDirect Journals Complete
Available from 2011 volume: 20 issue: 1 until 2017 volume: 26 issue: 3.
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Publicly Available Content Database
Available from 01/01/1992 until 31/12/1997.
Available from 01/01/2015.
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PubMed Central
Available from 2022 volume: 31.
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PubMed Central Open Access
Available from 2022 volume: 31.
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Social Science Premium Collection
Available from 01/01/1992 until 31/12/1997.
Available from 01/01/2015.