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In addition to research papers, these archives store raw datasets, graphics, notes, and other by-products of investigation.
Some search engines, for example, can be accessed free of charge. The latter group generally includes services that index the contents of thousands of published journals, allowing for detailed searches on data fields such as author name, institution, title or keyword, and even funding sources.
Because many journals operate on a subscription model too, the process of obtaining full-text versions of papers can be complicated. Similarly, some authors publish their results in the form of preprints, posting them to preprint servers for immediate and free access.
The following selection samples a range of resources, including databases which, as discussed above, index the contents of journals either in a given specialty area or the full spectrum of research.
Others listed below offer consolidated coverage of multiple databases.
Your institution is likely subscribed to a range of research databases, speak to your librarian to see which databases you have access to, and how to go about your search.
Web of Science includes The Web of Science Core Collection, which covers more than 20,000 carefully selected journals, along with books, conference proceedings, and other sources.
The sources include academic publishers, universities, online repositories, books, and even judicial opinions from court cases.
Based on its indexing, Google Scholar provides citation counts to allow authors and others to track the impact of their work.
Begun in 1991 as a physics repository, Ar Xiv has expanded to embrace mathematics, astronomy, statistics, economics, and other disciplines.
The success of Ar Xiv spurred the development of, for example, Meanwhile, thousands of institutional repositories hold a variety of useful materials.