我正在撰写一篇将在科学期刊上发表的稿件。为此，我使用了 Springer Latex 模板。引用的参考文献按最终参考书目列表中的出现顺序显示。但是，每个条目前面的方括号中的编号缺失。所以，目前它看起来是这样的：
以下是一个小例子：
\documentclass{article}
\usepackage[natbibapa]{apacite}
\bibliographystyle{sn-apacite}
\begin{document}
Hello world [\citenum{Ljunggren2002}]
Hello world [\citenum{Anthony2000}]
\begin{thebibliography}{}
\providecommand{\doi}[1]{\url{https://doi.org/#1}}
\bibitem [\protect \citeauthoryear {%
Ljunggren%
\ \BBA {} {\AA}gren%
}{%
Ljunggren%
\ \BBA {} {\AA}gren%
}{%
{\protect \APACyear {2002}}%
}]{%
Ljunggren2002}
\APACinsertmetastar {%
Ljunggren2002}%
\begin{APACrefauthors}%
Ljunggren, F.%
\BCBT {}\ \BBA {} {\AA}gren, A.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2002}{}{}.
\newblock
{\BBOQ}\APACrefatitle {Development of a new damper to reduce resonant
vibrations in lightweight steel joist floors} {Development of a new damper to
reduce resonant vibrations in lightweight steel joist floors}.{\BBCQ}
\newblock
\APACjournalVolNumPages{Applied Acoustics}{63}{11}{1267-1280}.
\newblock
\newblock
\PrintBackRefs{\CurrentBib}
\bibitem [\protect \citeauthoryear {%
Anthony%
, Elliott%
\BCBL {}\ \BBA {} Keane%
}{%
Anthony%
\ \protect \BOthers {.}}{%
{\protect \APACyear {2000}}%
}]{%
Anthony2000}
\APACinsertmetastar {%
Anthony2000}%
\begin{APACrefauthors}%
Anthony, D.%
, Elliott, S.%
\BCBL {} Keane, A.%
\end{APACrefauthors}%
\unskip\
\newblock
\APACrefYearMonthDay{2000}{}{}.
\newblock
{\BBOQ}\APACrefatitle {Robustness of optimal design solutions to reduce
vibration transmission in a lightweight 2-D structure, part i: Geometric
design} {Robustness of optimal design solutions to reduce vibration
transmission in a lightweight 2-d structure, part i: Geometric
design}.{\BBCQ}
\newblock
\APACjournalVolNumPages{Journal of Sound and Vibration}{229}{3}{505-528}.
\newblock
\newblock
\PrintBackRefs{\CurrentBib}
\end{thebibliography}
\end{document}
如何在方括号中添加缺失的数字？
我使用的 apacite.bst 文件是 Springer Latex 模板的一部分，可以在此处下载：https://www.springernature.com/gp/authors/campaigns/latex-author-support
提前致谢！