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# Publications
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## 1. Unpaywall
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In the first step, Unpaywall takes all publications that meet the following conditions:
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* genre = "journal-article"
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* is_paratext = false
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Information taken from the Unpaywall data set:
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* DOI
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* journal(ISSNs)
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* publisher
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* OA model
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* publication date
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In addition, the publisher is labelled as open access using a stored list.
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## 2. CrossRef list of titles
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Next, the ISSNs provided by Unpaywall are looked up in the Crossref list of titles. All available ISSNs are taken into account and compared on an individual basis. If exactly one result is found, the respective journal is included.
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After that, further information for the journal is added and mapping is carried out via ISSNs:
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* DOAJ for the OA model assigned to the journal
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* static lists of journals (mirror journals, journals for DFG applications, OA publishers)
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## 3. Dimensions / Web of Science
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The following information is taken from Dimensions or Web of Science:
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* institutions involved and corresponding status
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* number of citations
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The mapping between Unpaywall and Dimensions/Web of Science is carried out via the DOI and is successful if exactly one publication is found for the DOI. GRID is taken as the standard data set for the institutions. Dimensions supports GRID as a standard procedure; for Web of Science, a separate mapping is maintained.
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# Publication fees
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## 1. OpenAPC
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Most of the publication fees included in the OA monitor come from OpenAPC. The following information is taken from the OpenAPC data set:
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* DOI
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* year
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* institution paying fees
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* fees
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* type of fees (OA / hybrid OA)
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## 2. Unpaywall
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Further information from Unpaywall is added to the OpenAPC data set. For this purpose, the respective publication is again identified via the DOI. The information from Unpaywall is analogous to the “Publications” section:
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* journal (including Crossref list of titles)
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* publisher
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* OA model
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* publication date |
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\ No newline at end of file |
