@Book{Heigel1892,
author  = "Heigel, Karl Theodor von",
title   = "Die Wittelsbachische Hausunion vom 15. Mai 1724",
year    = "1892",
address = "München",
series  = "Sitzungsberichte",
volume  = "1891,7",
url     = "https://publikationen.badw.de/en/003204870",
}