<a href="https://en.wikipedia.org/wiki/en:Sergei_Senkin" class="extiw" title="w:en:Sergei Senkin">Sergei Senkin</a>, "Non Objective Composition,"1921
<a href="//commons.wikimedia.org/wiki/M.T._Abraham_Foundation" class="mw-redirect" title="M.T. Abraham Foundation">M.T. Abraham Foundation</a>
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