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| depth = Index, abstract & full-text …PubMed Central is more than a document repository. Submissions to PMC are indexed and formatted for enhanced [[metadata]], medical [[Ontology (information

…omise and problems for scholarly publishing |journal=Journal of Electronic Publishing |volume=4 |issue=2 |doi=10.3998/3336451.0004.203 |doi-access=free}}</ref>… …ces is planned.<ref>{{cite journal|doi=10.1787/603233448430 |title=We Need Publishing Standards for Datasets and Data Tables |date=2009|journal=Research Informat

| cost = Mostly [[Gratis versus libre#Uses in open-access academic publishing|fee-free]] (monetarily gratis) | depth = Index, abstract, and full-text

* older references from the print version of ''[[Index Medicus]]'', back to 1951 and earlier * references to some journals before they were indexed in Index Medicus and MEDLINE, for instance [[Science (journal)|''Science'']], ''[[BM

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其中''T''是[[index set]]。 …t anomalies with state-of-the-art machine learning methods|publisher=Packt Publishing|edition=1st|isbn=978-1801819626|url=https://www.packtpub.com/product/machin

…erial number]] used to [[unique identifier|uniquely identify]] a [[serial (publishing)|serial publication]], such as a magazine.<ref name=Whatis>{{cite web |url= …e-url=https://web.archive.org/web/20230802120549/https://journal-index.org/index.php/issnChecker |url-status=live }}</ref>