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I try to compile th following document. If I load both bidi and hyperref, Mittelbach is not hyphenated. If I comment out one of them, everything is fine. The bstfile is here: http://celxj.org/downloads/unified.bst

\documentclass{scrbook}

\usepackage{natbib}
\bibliographystyle{unified} 

\usepackage[hyphens]{url}
\urlstyle{same}


\usepackage{hyperref}

\usepackage{bidi}

\usepackage{filecontents}

\begin{filecontents}{SM.bib}
@book{GMS2013a,
        Address = {Boston},
        Author = {Frank Mittelbach and Michael Goossens},
        Edition = {2},
        Publisher = {Addison-Wesley},
        Title = {The {\LaTeX} Companion},
        Year = {2013}}
\end{filecontents}

\begin{document}

Xx There is a huge amount of packages that can be used for various purposes. \citet{GMS2013a} is a good
reference book.

\bibliography{SM}

\end{document}
  • natbib doesn't have support for multiple languages; you may be luckier with biblatex. – egreg Nov 1 '13 at 16:21
  • I think it is not a natbib problem. The hyphenation works fine if bidi is not loaded. With bidi loaded not even explicit hyphenation with \hypehenation{Mit-tel-bach} is taken into account. If I use \-in the bibtex entry it works. If it was possible to extract the right to left typesetting from the bidi package, I would go for this. This would safe me the trouble with all the modified commands and side effects. – Stefan Müller Nov 1 '13 at 20:00
  • The bidi manual says in Section 2.3 that there are problems with hyperref if a link spans more than a line. I guess this is the reason for my problem as well. – Stefan Müller Nov 2 '13 at 6:20
  • Would you mind posting a rendering to illustrate why 'Mittelbach' should/should not be hyphenated? – einpoklum Dec 13 '13 at 12:33
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UPDATE 2: Peter Breitenlohner said:

The solution is probably a modified definition of 'potentially hyphenatable part' in tex.web ([40] Pre-hyphenation).

\hyphenation{first-word next-word last-word}
\showhyphens{start $ $firstword nextword nextword lastword$ $ end}
\bye

This does not seem to be bidi's problem but etex's problem. Try this (without using bidi):

\documentclass{scrbook}

\usepackage{natbib}
\bibliographystyle{unified} 

\usepackage[hyphens]{url}
\urlstyle{same}


\usepackage{hyperref}

%\usepackage{bidi}

\TeXXeTstate=1

\usepackage{filecontents}

\begin{filecontents}{SM.bib}
@book{GMS2013a,
        Address = {Boston},
        Author = {Frank Mittelbach and Michael Goossens},
        Edition = {2},
        Publisher = {Addison-Wesley},
        Title = {The {\LaTeX} Companion},
        Year = {2013}}
\end{filecontents}

\begin{document}
Xx There is a huge amount of packages that can be used for various purposes. \beginL\citet{GMS2013a}\endL{} is a good
reference book.

\bibliography{SM}

\end{document}

Even a more minimal example:

\documentclass{scrbook}
\TeXXeTstate=1
\begin{document}
Xx There is a huge amount of packages that can be used for various purposes. \beginL Mittelbach \&  Goossens\endL{} is a good
reference book.
\end{document}

Also what you said in the comment about bidi manual and hyperref has nothing to do with this.

UPDATE: I have reported this issue to the author of e-tex; hopefully he has got a fix for this. Well, from my side, there is nothing to do except waiting for his reply.

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This issue has been fixed in TeXLive sources. See this commit. So wait for texlive 2014 or build xetex from source.

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