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DOAJ Directory of Open Access Journals
Available from 2019.
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Freely available EZB journals
Available from 2010 volume: 6 issue: 1 until 2018 volume: 14 issue: 4.
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Publicly Available Content Database
Available from 01/12/2019.
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Springer Nature OA Free Journals
Available from 01/12/2019 volume: 15 issue: 1 until 31/12/2023 volume: 19 issue: 1.