@Book{Bopp1980,
author  = "Bopp, Fritz",
title   = "Über den Zustandsraum der Quantenphysik",
year    = "1980",
address = "München",
series  = "Sitzungsberichte",
volume  = "1979,8",
url     = "https://publikationen.badw.de/en/012320218",
}