大量 bibitem 导致的 LaTeX 错误

Question

我的文档 8POGL.tex 中的参考书目如下：

\begin{thebibliography}{1099}

\bibitem{gadelhak} Gad-el-Hak, M., Ed., 2006, \textit{The MEMS Handbook - Introduction and Fundamentals}, Taylor \& Francis Group.
\bibitem{richard} Feynman, R. P., 1960, "There's Plenty of Room at the Bottom", Engineering and Science, \textbf{23}(5), pp. 22-36.
\bibitem{sandia-sajt} Sandia National Laboratories, n.d., http://mems.sandia.gov

\end{thebibliography}

只显示了 3 个项目，但实际上有 100 多个项目。所有项目在数量较少时（从 1 到 30 左右）都正常工作，但所有项目都出现错误：

! LaTeX Error: \begin{thebibliography} on input line 10 ended by \end{document}
.
See the LaTeX manual or LaTeX Companion for explanation.
Type H <return> for immediate help.
...
l.140 \end{document}
Your command was ignored.
Type I <command> <return> to replace it with another command,
or <return> to continue without it.
Package atveryend Info: Empty hook `BeforeClearDocument' on input line 140.
Package atveryend Info: Empty hook `AfterLastShipout' on input line 140.

主文档中的第 140 行：

\begin{document}
\input{8POGL}
\end{document}  (line 140)

这个问题应该怎么解决呢，因为参考书目中没有 \end{document}？我也很困惑，因为项目数量较少却没有错误？