<a href="https://en.wikipedia.org/wiki/J%C3%B6rg-R%C3%BCdiger_Sack" class="extiw" title="en:Jörg-Rüdiger Sack">Jörg-Rüdiger Sack</a> at <a href="https://en.wikipedia.org/wiki/SWAT_and_WADS_conferences" class="extiw" title="en:SWAT and WADS conferences">WADS 2015</a>
<a href="//commons.wikimedia.org/wiki/User:David_Eppstein" class="mw-redirect" title="User:David Eppstein">David Eppstein</a>
CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>