@Book{Heisenberg1920,
author  = "Heisenberg, August",
title   = "Aus der Geschichte und Literatur der Palaiologenzeit",
year    = "1920",
address = "München",
series  = "Sitzungsberichte",
volume  = "1920,10",
url     = "https://publikationen.badw.de/en/003199390",
}