<a href="https://en.wikipedia.org/wiki/Nikolay_Vasilyevich_Fyodorov" class="extiw" title="en:Nikolay Vasilyevich Fyodorov">Nikolay Vasilyevich Fyodorov</a>, "Kontur", Cheboksary, 23 june 2010
<a href="//commons.wikimedia.org/wiki/User:Exlex" title="User:Exlex">exlex</a>
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<span class="int-own-work" lang="en">Own work</span>