The SAO/NASA Astrophysics Data System (ADS) is a Digital Library portal for researchers in Astronomy and Physics, operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant. The ADS maintains three bibliographic databases containing more than 8.7 million records: Astronomy and Astrophysics, Physics, and arXiv e-prints.

The SAO/NASA Astrophysics Data System (ADS) is a Digital Library portal for researchers in Astronomy and Physics, operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant. The ADS maintains three bibliographic databases containing more than 8.7 million records: Astronomy and Astrophysics, Physics, and arXiv e-prints.

A citation reference that includes the Web of Science (Science Citation Index, 1899-present, the Social Science Citation Index, 1898-present, and the Arts and Humanities Citation Index, 1975-present), Book Citation Index- Science (2005-present), Book Citation Index- Social Sciences & Humanities (2005-present), Medline and Journal Citation Reports, among other science and social science reference indexes. [Not compatible with Internet Explorer 9]

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