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DOAJ Directory of Open Access Journals
Available from 1982.
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Publicly Available Content Database
Available from 01/01/1982 until 31/12/1983.
Available from 01/01/1986 until 31/12/1992.
Available from 01/01/1994 until 31/12/1999.
Available from 01/01/2001 until 31/12/2001.
Available from 01/01/2003 until 31/01/2021.
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PubMed Central
Available from 2019 volume: 31.