Smithsonian/NASA Astrophysics Data System (ADS)

The ADS maintains collections of scientific publications containing more than 15 million records covering publications (including arXiv e-prints) in Astronomy and Astrophysics, Planetary Sciences, and related research. In addition to maintaining its bibliographic corpus, the ADS tracks citations and usage of its records to provide advanced discovery and evaluation capabilities. Integrated in its collections, the ADS provides access to a wealth of external resources, including electronic articles available from publishers’ websites, astronomical object information, data catalogs and data sets hosted by external archives.