Name of the BibTeX bibliography file (e.g.,
        ``'mybibliography.bib'``).

def bib_name(self):
        """Name of the BibTeX bibliography file (e.g.,
        ``'mybibliography.bib'``).
        """
        bib_name = None
        for match in texutils.bib_pattern.finditer(self.text):
            bib_name = match.group(1)
            if not bib_name.endswith('.bib'):
                bib_name = ".".join((bib_name, "bib"))
        return bib_name