@Book{Wagner1914,
author  = "Wagner, Ernst",
title   = "Spektraluntersuchungen an Röntgenstrahlen. Spektraluntersuchungen an Röntgenstrahlen",
year    = "1914",
address = "München",
series  = "Sitzungsberichte",
volume  = "1914,15",
url     = "https://publikationen.badw.de/de/003900675",
}