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.

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, [])