Make sure the BibTeX file is encoded in ISO 8859-1
Make sure the BibTeX file is encoded in ISO 8859-1

BibTeX cannot handle UTF-8 files, so it is necessary to make sure that all
the text is reencoded in Latin 1. This also means that all the non-Latin1
characters must be removed (or transformed, but that is hard in XSLT 1).

gioele/w3c-bibtex