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/usr/share/highlight/langDefs/bibtex.lang is in highlight-common 3.8-2.

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-- Language definition generated by lang2to3

Description="BibTeX"

Keywords={
  { Id=1,
    List={"address", "annote", "author", "title", "type", "abstract", "volume", "pages", "number", "note", "key", "organization", "school", "series", "chapter", "month", "department", "keywords", "howpublished", "institution", "journal", "publisher", "editon", "editor", "year", "booktitle"},
  },
}

IgnoreCase=false

Comments={
  { Block=false,
    Delimiter= { [[%]] },
  },
}

Operators=[[\(|\)|\[|\]|\{|\}|\,|\;|\:|\&|\<|\>|\!|\=|\/|\*|\+|\-]]