CC BY-SA 4.0
<span class="int-own-work" lang="en">Own work</span>, with elements by <a href="//commons.wikimedia.org/wiki/User:ET72" title="User:ET72">ET72</a>, <a href="//commons.wikimedia.org/wiki/User:Heralder" title="User:Heralder">Heralder</a>, <a href="//commons.wikimedia.org/wiki/User:Sodacan" title="User:Sodacan">Sodacan</a>, <a href="//commons.wikimedia.org/wiki/User:Erlenmeyer" title="User:Erlenmeyer">Erlenmeyer</a>