\reserved@a 定义中的参数编号非法 natbib 书目错误：空书目

Question

当我使用此代码时：

\documentclass[portuges]{article}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage[square,numbers]{natbib}
\usepackage{indentfirst}
\usepackage{graphicx}
\usepackage{caption}
\usepackage{subcaption}
\usepackage{xcolor}
\usepackage{geometry}
\geometry{tmargin=2cm,lmargin=2.2cm,rmargin=2cm,bmargin=2.2cm}

\begin{document}

\bibliographystyle{plainnat}
\bibliography{Ref}

\end{document}

我不断得到：

Package natbib Warning: Citation `Frid' on page 5 undefined on input line 167.

Package natbib Warning: Citation `artcl' on page 5 undefined on input line 173.

Package natbib Warning: Citation `cap' on page 5 undefined on input line 190.

(TPC_eletro.bbl
! Illegal parameter number in definition of \reserved@a.
<to be read again>

我做错了什么？我的 bib 文件如下所示：

@Book{Frid,
  author    = {Fridman, Alexander},
  publisher = {Taylor \& Francis},
  title     = {Plasma physics and engineering},
  year      = {2004},
  address   = {New York},
  isbn      = {1560328487},
  pages     = {559-560},
  pagetotal = {2},
}

@Article{artcl,
  author  = {Alice Hong},
  title   = {Dielectric Strength of Air},
  year    = {2000},
  comment = {An educational, fair use website},
  url     = {https://hypertextbook.com/facts/2000/AliceHong.shtml},
}

@Article{cap,
  title = {Cylindrical Capacitor},
  year  = {2006},
  url   = {http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capcyl.html#c2},
}

@Article{plast,
  journal = {Omnexus},
  title   = {Dielectric Constant},
  year    = {2015},
  comment = {An educational, fair use website},
  url     = {https://omnexus.specialchem.com/polymer-properties/properties/dielectric-constant},
}

即使没有这个包装它也能运行得很好natbib。

Answer 1

无论何时在文档中排版 URL，加载url或hyperref包都是一个好主意（url如果您只关心 URL，则加载；hyperref如果您想要链接的 URL 和文档中的附加链接（例如来自\ref或目录中的链接），则hyperref加载；url因此通常不需要同时加载两者）。

如果未url加载hyperref任何内容，natbib则使用 fallback 定义来打印无法#正确处理特殊字符的 URL。如果 URL 中出现此类字符，您可能会收到非常隐晦的错误消息，如问题中引用的 only 所示。

\documentclass[portuges]{article}
\usepackage[utf8]{inputenc}
\usepackage{babel}
\usepackage[square,numbers]{natbib}
\usepackage{url}
% or
%\usepackage{hyperref}

\begin{filecontents}{\jobname.bib}
@misc{cap,
  title = {Cylindrical Capacitor},
  year  = {2006},
  url   = {http://hyperphysics.phy-astr.gsu.edu/hbase/electric/capcyl.html#c2},
}
\end{filecontents}

\begin{document}
\citep{cap}

\bibliographystyle{plainnat}
\bibliography{\jobname}
\end{document}