\cite[text]{key_list}
The key_list
argument is a list of citation keys. This command
generates an in-text citation to the references associated with the
keys in key_list
by entries on the aux file read by the
\begin{document}
command.
\bibitem
and \cite
are used
together much as \label
and
\ref
to produce a correspondence
between items in the Reference or Bibliography
(thebibliography
environment).
The \cite
command is fragile.