Return the page range or the article id of a record.

        Args:
            separator(basestring): optional page range symbol, defaults to a single dash

        Returns:
            string: the page range or the article id of the record.

        Examples:
            >>> record = {
            ...     'publication_info': [
            ...         {'artid': '054021'},
            ...     ],
            ... }
            >>> LiteratureReader(record).get_page_artid()
            '054021'

def get_page_artid(self, separator='-'):
        """Return the page range or the article id of a record.

        Args:
            separator(basestring): optional page range symbol, defaults to a single dash

        Returns:
            string: the page range or the article id of the record.

        Examples:
            >>> record = {
            ...     'publication_info': [
            ...         {'artid': '054021'},
            ...     ],
            ... }
            >>> LiteratureReader(record).get_page_artid()
            '054021'

        """
        publication_info = get_value(
            self.record,
            'publication_info[0]',
            default={}
        )
        return LiteratureReader.get_page_artid_for_publication_info(
            publication_info,
            separator
        )