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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. See Viewing
Cross-References.