@@ -159,3 +159,20 @@ We will then prioritize the standardization for your institution.
The publication date is taken from [Unpaywall](https://unpaywall.org/).
In Unpaywall, the field is described as follows: _"As reported by the publishers, who unfortunately have inconsistent definitions of what counts as officially 'published'. Returned as an [ISO8601-formatted](https://xkcd.com/1179/) timestamp, generally with only year-month-day."_ (s. Unpaywall, [published_date](https://unpaywall.org/data-format))
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<summary><strong>What is a mirror journal?<strong></summary>
A mirror journal is a fully open access version of an existing subscription journal, with the same editorial board, aims and scope, peer review processes and policies and an editorial board with at least 50% of the same members. The journal may have a similar name as the subscription title, but it must have a different ISSN. Mirror journals do not meet the funding criteria of the DFG. Titles are continuously researched and, if necessary, included in the journal list 'Mirror Journals'.
See also [Journal Lists](English Version/Source Databases/Journal Lists)
