Prof. Dr. Hans Kroha.

Links
- https://www.pi.uni-bonn.de/en/news/when-electrons-slowly-vanish-during-cooling/prof-dr-hans-kroha.jpeg/image_view_fullscreen
- https://www.pi.uni-bonn.de/en/news/when-electrons-slowly-vanish-during-cooling/prof-dr-hans-kroha.jpeg/@@download/image/Prof. Dr. Hans Kroha..jpeg