Retardation effects for the electron energy loss probability in gap and si. <em>Physics Letters A</em>, 26(8):339–340, 1968. <a class="reference external" href="https://doi.org/https://doi.org/10.1016/0375-9601(68)90360-5">doi:https://doi.org/10.1016/0375-9601(68)90360-5</a>.</p>
</div>
<div class="citation" id="id26" role="doc-biblioentry">
<span class="label"><span class="fn-bracket">[</span>11<span class="fn-bracket">]</span></span>
<p>P. Moreau, N. Brun, C. A. Walsh, C. Colliex, and A. Howie. Rel