def pdfextract_dois(pdf_file):
    """
    Extract DOIs of references using \
            `pdfextract <https://github.com/CrossRef/pdfextract>`_.

    .. note::

        See ``libbmc.citations.pdf.pdfextract`` function as this one is just \
                a wrapper around it.
        See ``libbmc.citations.plaintext.get_cited_dois`` as well for the \
                returned value, as it is ultimately called by this function.

    :param pdf_file: Path to the PDF file to handle.
    :returns: A dict of cleaned plaintext citations and their associated DOI.
    """
    # Call pdf-extract on the PDF file
    references = pdfextract(pdf_file)
    # Parse the resulting XML
    root = ET.fromstring(references)
    plaintext_references = [e.text for e in root.iter("reference")]
    # Call the plaintext methods to fetch DOIs
    return plaintext.get_cited_dois(plaintext_references)