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Updated reference 13 (which concerns the mirror sites) and the associated information from the 2008 site to the 2022 site. Additionally made some minor edits to correct grammatical errors and typos. |
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The '''SAO/NASA Astrophysics Data System''' ('''ADS''') is a [[digital library]] portal for researchers on [[astronomy]] and [[physics]], operated for [[NASA]] by the [[Smithsonian Astrophysical Observatory]]. ADS maintains three bibliographic collections containing over 15 million records, including all [[arXiv]] e-prints.<ref>{{Cite web |title=About ADS |url=https://ui.adsabs.harvard.edu/about/ |access-date=2024-07-20 |website=ui.adsabs.harvard.edu}}</ref>
==Historical context==
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