Bertrand Russell signature.
<ul><li>Bertrand Russell</li>
<li>derivative work (vectorisation): <a href="//commons.wikimedia.org/wiki/User:Conquistador" title="User:Conquistador">Conquistador</a></li></ul>
Own work  using: <a rel="nofollow" class="external text" href="http://www.historyforsale.com/productimages/jpeg/155437.jpg">Bertrand Russell signature</a>