<a href="https://en.wikipedia.org/wiki/Ludwig_Martens" class="extiw" title="w:Ludwig Martens">Ludwig Martens</a>, Soviet photo,
<span lang="en">Anonymous</span><span style="display:none">Unknown author</span>
<a rel="nofollow" class="external free" href="http://www.pseudology.org/MID/Martens.htm">http://www.pseudology.org/MID/Martens.htm</a>