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DOAJ Directory of Open Access Journals
Available from 2021.
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SpringerLink Journals - AutoHoldings
Available from 01/01/1997 volume: 8 issue: 1 until 05/12/2020 volume: 31 issue: 12.
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Springer Nature OA Free Journals
Available from 01/06/1990 volume: 1 issue: 1.