<ul><li><a href="https://en.wikipedia.org/wiki/Avangard_(hypersonic_glide_vehicle)" title="Avangard (hypersonic glide vehicle)">Avangard</a> Mach 20<sup id="cite_ref-19" class="reference"><a href="#cite_note-19"><span class="cite-bracket">[</span>19<span class="cite-bracket">]</span></a></sup></li></ul>
