ss="arabic simple">
<li><ol class="upperalpha simple" start="10">
<li><p>Lawson <a class="reference external" href="https://books.google.ru/books/about/The_Physics_of_Charged_particle_Beams.html?id=j87vAAAAMAAJ&amp;redir_esc=y">“Physics of charged particle beams”</a></p></li>
</ol>
</li>
</ol>
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