\bibitem
\bibitem[label]{cite_key}
The \bibitem
command generates an entry labelled by
label. If the label argument is missing, a number is
automatically generated using the enumi
counter. The
cite_key is any sequence of letters, numbers, and punctuation
symbols not containing a comma.
This command writes an entry to the .aux file containing the
item's cite_key and label. When the .aux file is read by
the \begin{document}
command, the item's label
is
associated with cite_key
, causing references to cite_key
with a \cite
command (see next section) to produce the
associated label.