https://web.archive.org/web/20140307043527/http://www.elwis.de/BfS/bfs_start.php?target=3&source=1&aboexport=abo&db_id=13496

Keine Beschreibung vorhanden.

Ludwig Plate

https://web.archive.org/web/20091020023440/http://www-user.uni-bremen.de/~bremhist/LudwigPlate.html

Keine Beschreibung vorhanden.