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I have a problem using utopia fonts with xltxtra and biber when using non-ascii characters. The problem disappears if using computer-modern (off-shelf LaTeX) or bibtex instead of biber. Here's an example:

  \citet{Babuska:73:article:The-finite} is not ascii.

where the biberUTF8test.bib is

  Author = {Ivo Babuška},
  Doi = {10.1007/BF01436561},
  Fjournal = {{Numerische Mathematik}},
  Issn = {0029-599X; 0945-3245/e},
  Journal = {Numer. Math.},
  Language = {English},
  Msc2010 = {65N30 65N15 35J20},
  Pages = {179--192},
  Publisher = {Springer-Verlag, Berlin},
  Title = {The finite element method with {Lagrangian} multipliers.},
  Volume = {20},
  Year = {1973}}

running xelatex, biber, xelatex fails to show the š in the author's name, but

commenting the third line in the first file and running same sequence works


replacing biber by bibtex in the fourth line of first file and same sequence also works

Any clue someone? Many thanks.

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Welcome to TeX.SX! It doesn't make much sense to use mathdesign with XeLaTeX. Just do \usepackage[utf8]{inputenc} instead of xltxtra and compile with pdflatex. – egreg Aug 22 '14 at 11:04
If you simply add a š to your source you'll see the same issue, BTW. – Joseph Wright Aug 22 '14 at 11:06
up vote 6 down vote accepted

The fonts used by mathdesign are not compatible with XeLaTeX and fontspec, because they're neither OpenType nor TrueType fonts.

Replace \usepackage{xltxtra} with


and compile with pdflatex.

enter image description here

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