def _references(self, i, sequence=False):
        """Handle references."""

        c = next(i)
        if c == '\\':
            # \\
            if sequence and self.bslash_abort:
                raise PathNameException
        elif c == '/':
            # \/
            if sequence and self.pathname:
                raise PathNameException
            elif self.pathname:
                i.rewind(1)
        else:
            # \a, \b, \c, etc.
            pass