@Book{Wagner1916,
author  = "Wagner, Ernst",
title   = "Spektraluntersuchungen an Röntgenstrahlen. Spektraluntersuchungen an Röntgenstrahlen II",
year    = "1916",
address = "München",
series  = "Sitzungsberichte",
volume  = "1916,3",
url     = "https://publikationen.badw.de/en/003900677",
}