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DOAJ Directory of Open Access Journals
Available from 2016.
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Publicly Available Content Database
Available from 01/02/2009.
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SpringerLink Journals - AutoHoldings
Available from 01/02/2009 volume: 52 issue: 1 until 18/04/2020 volume: 63 issue: 1.
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Springer Nature OA Free Journals
Available from 2019 volume: 62 issue: 1.