0

I am using {natbib} package for the bibliography style and {splitbib} package for separate my bibiography into categories at the end of my documents, for example : all articles in one group, all the books in an other group.

The author of {splitbib} advised to use the [export] argument when usign {natbib} package.

Everything is working, I have my final document as I wanted but the problem is that I get an error message from LaTeX : "Undefined control sequence \begin{thebibliography}"

If I don't use {natbib} package, I don't have any error. If I use {natbib} package without [export] argument it is worth. If I use {natbib} package with [export] argument it works but with an error message.

How can I solve this ?

Thank you

Here is an example :

\documentclass[a4paper,12pt]{book}

\usepackage[comma,longnamesfirst]{natbib}
\bibliographystyle{plainnat}
\usepackage[export]{splitbib}

\begin{category}{Articles}
\SBentries{Article1,Article2}
\end{category}
\begin{category}{Books}
\SBentries{Book1,Book2}
\end{category}

\usepackage{filecontents}

\begin{filecontents}{bibliography.bib}

@article{Article1,
author={Jhon Doe},
title={Blabla},
journal={Blabla},
year={2019},
volume={145},
number={4},
pages={1-25}
}
@book{Book2,
author={Fabrice Doe},
title={Blabla4},
journal={Blabla4},
year={2016},
volume={142},
pages={4-22}
}
\end{filecontents}

\begin{document}

I want to cite Article1~\cite{Article1} and then Book2~\cite{Book2}.

\bibliography{bibliography}

\end{document}
1

The undefined command is not \begin{bibliography} but \SBlongestlabel:

! Undefined control sequence.
\thebibliography ...\expandafter {\SBlongestlabel 
                                                  } \immediate \write \NMSB@...
l.1 \begin{thebibliography}{2}

It is clearly a bug in the package, but it is not completly clear what the author intended.

The following patch could work:

\documentclass[a4paper,12pt]{book}

\usepackage[comma,longnamesfirst]{natbib}
\bibliographystyle{plainnat}
\usepackage[export]{splitbib}

\begin{category}{Articles}
\SBentries{Article1,Article2}
\end{category}
\begin{category}{Books}
\SBentries{Book1,Book2}
\end{category}

\usepackage{filecontents}

\begin{filecontents}{bibliography.bib}

@article{Article1,
author={Jhon Doe},
title={Blabla},
journal={Blabla},
year={2019},
volume={145},
number={4},
pages={1-25}
}
@book{Book2,
author={Fabrice Doe},
title={Blabla4},
journal={Blabla4},
year={2016},
volume={142},
pages={4-22}
}
\end{filecontents}
\makeatletter
\usepackage{xpatch}
\xpatchcmd\thebibliography
 {\expandafter\NMSB@tok\expandafter{\SBlongestlabel}}
 {\@ifundefined{SBlongestlabel}{\NMSB@tok{}}{\expandafter\NMSB@tok\expandafter{\SBlongestlabel}}}
 {}{\fail}
\makeatother
\begin{document}

I want to cite Article1~\cite{Article1} and then Book2~\cite{Book2}.


\bibliography{bibliography}

\end{document}
  • It works ! thank you very much. Finally what did you add ? You force the program to not display the error ? – Maxime Aug 8 at 15:20

Your Answer

By clicking “Post Your Answer”, you agree to our terms of service, privacy policy and cookie policy

Not the answer you're looking for? Browse other questions tagged or ask your own question.