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DOAJ Directory of Open Access Journals
Available from 1998.
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EBSCOhost Academic Search Ultimate
Available from 01/08/2007.
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Emis Free
Available from 1998 volume: 1.
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Publicly Available Content Database
Available from 01/01/1998 until 31/12/2015.
Available from 01/01/2017 until 31/12/2017.
Available from 01/01/2019.
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Springer Nature OA Free Journals
Available from 01/12/1998 volume: 1 issue: 1.