The Harvard-Smithsonian Center for Astrophysics (CfA), the Astrophysics Data System
(ADS), the CfA's John C.
Quoted from the website] 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.
This research made use of SIMBAD and Vizier, operated through the Centre de Donnees Astronomiques (Strasbourg, France), and the NASA/Smithsonian Astrophysics Data System
edu/ The NASA Astrophysics Data System
(ADS) is a digital library for astronomy and astrophysics, instrumentation, physics and geophysics, and preprints in astronomy.
compile papers by an international group of librarians, astronomers, and information specialists regarding the Virtual Observatory, citation analysis for astronomy, open access, technologies beyond the Astrophysics Data System
(ADS) and Google, creativity in libraries, preservation, the history of astronomy and astronomical archives, and e-journals and the changing publishing sector.
In a related project, the NASA-funded Astrophysics Data System
, located at the Smithsonian Astrophysical Observatory in Cambridge, Mass.