@Book{Heisenberg1900,
author  = "Heisenberg, August",
title   = "Studien zu Georgios Akropolites",
year    = "1900",
address = "München",
series  = "Sitzungsberichte",
volume  = "1899,2,10",
url     = "https://publikationen.badw.de/en/023391113",
}