I have a persistent problem when I try to construct bibliographic references using 'exotic' accents. An example is provided below, with the error message. I am aware that this is a known problem, but I don't understand what the core of the problem is (I just suppose that it has something to do with multibyte segmentation) and, anyway, I just found some hints at rather cryptic workarounds.
Anticipated thanks for enlightening me.




\usepackage[left=2.50cm, right=2.50cm, top=2.50cm, bottom=2.50cm]{geometry}



On this notion see the work of Búbür (2009).  \\\  
On this notion see \cite{Búbür2009}.


\newblock Búbür, Bub (2009).
\newblock A theory of everything plus something else.
\newblock \textit{Journal of Unfocusing} 12, pp.\ 22-39.



pdflatex loudly complains as soon as it sees the first accented u:

! Missing \endcsname inserted.
<to be read again> 
l.21 ...year{Búbür}{Búbür}{2009}]{Búbür2009}

The control sequence marked <to be read again> should
not appear between \csname and \endcsname.

! Improper alphabetic constant.
<to be read again> 
l.21 ...year{Búbür}{Búbür}{2009}]{Búbür2009}

A one-character control sequence belongs after a ` mark. So I'm essentially inserting \0 here.

  • Welcome to TeX.SX! You can have a look at our starter guide to familiarize yourself further with our format. – Heiko Oberdiek Apr 2 '14 at 10:24
  • The error is in using accents in the key, which is just an arbitrary label; use \cite{bubur2009} and change the key in the bib file. – egreg Apr 2 '14 at 10:30

From CTAN:

BibTeX it­self is an ASCII-only pro­gram; there is, how­ever, a ver­sion that copes with 8-bit char­ac­ter sets. How­ever, BibTeX’s fa­cil­i­ties rapidly run out as one moves away from sim­ple ASCII (for ex­am­ple, in the var­i­ous na­tional sort­ing rules for lan­guages ex­pressed in dif­fer­ent parts of ISO-8859 — the “ISO Latin” se­ries). For more flex­i­bil­ity, the user is urged to con­sider us­ing biber with bibla­tex to type­set its out­put. In par­tic­u­lar, it is best to avoid BibTeX in favour of bibla­tex, if at all pos­si­ble.

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