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<p>Rolf Erni and Nigel D. Browning. The impact of surface and retardation losses on valence electron energy-loss spectroscopy. <em>Ultramicroscopy</em>, 108(2):84–99, 2008. <a class="reference external" href="https://doi.org/https://doi.org/10.1016/j.ultramic.2007.03.005">doi:https://doi.org/10.1016/j.ultramic.2007.03.005</a>.</p>
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