NASA ADS

Researchers search by author, object, or topic, and export references to BibTeX and other formats. It shows citations and metrics, and links to the full text where available. Libraries and observatories also use its API.

It is run by the Smithsonian Astrophysical Observatory with NASA support. Coverage outside its core fields is thinner.

Semantic Scholar and Google Scholar are broader. NASA ADS suits astronomers and astrophysicists.