code: def get_page_artid(self, separator='-'):
          
          publication_info = get_value(
              self.record,
              'publication_info[0]',
              default={}
          )
          return LiteratureReader.get_page_artid_for_publication_info(
              publication_info,
              separator
          )
docs: 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'