reftex: Citation Info

 
 4.3 Citation Info
 =================
 
 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.  SeeViewing
 Cross-References.