| Hittorfstraße |
Bildrechte: Unknown, <a rel="nofollow" href="https://commons.wikimedia.org/wiki/File:Hittorf_portrait_from_Festschrift_1904.jpg">Hittorf portrait from Festschrift 1904</a>, <a rel="nofollow" href="https://creativecommons.org/licenses/by/4.0/legalcode" rel="license">CC BY 4.0</a>