reftex: Citation Info
4.3 Citation Info
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When point is idle for more than ‘reftex-idle-time’ seconds on the
argument of a ‘\cite’ macro, the echo area will display some information
about the article cited there. Note that the information is only
displayed if the echo area is not occupied by a different message.
RefTeX can also display the ‘\bibitem’ or BibTeX database entry
corresponding to a ‘\cite’ macro, or all citation locations
corresponding to a ‘\bibitem’ or BibTeX database entry. Viewing
Cross-References.