def grobid(pdf_folder, grobid_home=None, grobid_jar=None):
    """
    Run `Grobid <https://github.com/kermitt2/grobid>`_ on a given folder to \
            extract references.

    .. note::

        Before using this function, you have to download and build Grobid on \
                your system. See \
                `<https://grobid.readthedocs.org/en/latest/Install-Grobid/>`_ \
                for more infos on this. You need Java to be in your ``$PATH``.

    :param pdf_folder: Folder containing the PDF files to handle.
    :param grobid_home: Path to the grobid-home directory.
    :param grobid_jar: Path to the built Grobid JAR file.
    :returns: ``True``, or ``False`` if an error occurred.
    """
    # TODO: Should be using https://github.com/kermitt2/grobid-example and
    # BibTeX backend.
    if grobid_home is None or grobid_jar is None:
        # User should pass the correct paths
        return False

    try:
        subprocess.call(["java",
                         "-jar", grobid_jar,
                         # Avoid OutOfMemoryException
                         "-Xmx1024m",
                         "-gH", grobid_home,
                         "-gP", os.path.join(grobid_home,
                                             "config/grobid.properties"),
                         "-dIn", pdf_folder,
                         "-exe", "processReferences"])
        return True
    except subprocess.CalledProcessError:
        return False