<a href="https://en.wikipedia.org/wiki/Clothoid" class="extiw" title="w:Clothoid">Clothoid</a>
<a href="//commons.wikimedia.org/wiki/User:Modanung" title="User:Modanung">Modanung</a>
own work; to replace <a href="//commons.wikimedia.org/wiki/File:Clothoide.PNG" title="File:Clothoide.PNG">Image:Clothoide.PNG</a>