Drawn by the author Brian Burnell from a sketch and description in a scientific paper presented at a Royal Aeronautical Society symposium 2004 and re-published in <a href="//commons.wikimedia.org/wiki/Special:BookSources/1-85768-109-6" title="Special:BookSources/1-85768-109-6">ISBN 1-85768-109-6</a>. The drawing is entirely the author's own work and should be attributed to <a rel="nofollow" class="external text" href="http://www.nuclear-weapons.info">Brian.Burnell</a>.
<a rel="nofollow" class="external text" href="http://www.nuclear-weapons.info">Brian Burnell</a> (<a href="https://en.wikipedia.org/wiki/User:Brian.Burnell" class="extiw" title="en:User:Brian.Burnell">Brian.Burnell</a> at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a> at <a class="external text" href="https://en.wikipedia.org">en.wikipedia</a>)
CC BY 2.5
Transferred from <span class="plainlinks"><a class="external text" href="https://en.wikipedia.org">en.wikipedia</a></span> to Commons.