NASA Astrophysics Data System (ADS)
a digital library portal for researchers in astronomy and physics, operated by the Smithsonian Astrophysical Observatory (SAO) under a NASA grant
a database containg articles waiting to be published.
ISI Web of knowledge - Web of science
an academic citation indexing and search service. Its coverage encompasses the sciences, social sciences, arts and humanities.
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You are welcome to suggest additions to our collection (books, journals etc).