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  <section id="references">
<h1>References<a class="headerlink" href="#references" title="Link to this heading">#</a></h1>
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<div class="citation" id="hodges1990mixed" role="doc-biblioentry">
<span class="label"><span class="fn-bracket">[</span>hodges1990mixed<span class="fn-bracket">]</span></span>
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<li><p>Hodges. A mixed variational formulation based 