49.
    <a href="https://doi.org/10.1016/j.jmva.2015.01.020" class="external-link">https://doi.org/10.1016/j.jmva.2015.01.020</a>
    <a href="http://arxiv.org/pdf/1408.0424.pdf" class="external-link">http://arxiv.org/pdf/1408.0424.pdf</a></p>
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