EntityQ1789476· pop 23· linked from 301 articlesbibliographic databaseSign in to savedatabase providing an authoritative source of bibliographic informationConnectionsOurResearchEntitybookEntitynewspaperEntitycomputer scienceEntityNASAConceptInternational Standard Book NumberEntitydatabaseEntitydigital object identifierEntitypatentEntitysearch engineEntitydigital libraryEntitymonographEntityopen accessEntityacademic disciplineEntitylibrary catalogEntityUnited States National Library of MedicineEntityabstractEntityonline public access catalogEntityacademic journalEntitysubject headingEntityCategoriesBibliographic databases and indexesInformation scienceLibrary 2.0