docs: def get_author_tags(index_page):
      """
      Parse `authors` from HTML ``<meta>`` and dublin core.
  
      Args:
          index_page (str): HTML content of the page you wisht to analyze.
  
      Returns:
          list: List of :class:`.SourceString` objects.
      """
      dom = dhtmlparser.parseString(index_page)
  
      authors = [
          get_html_authors(dom),
          get_dc_authors(dom),
      ]
  
      return sum(authors, [])