@Book{Unger1891,
author  = "Unger, Georg Friedrich",
title   = "Die Abfassungszeit der ägyptischen Festkalender",
year    = "1891",
address = "München",
series  = "Abhandlungen",
volume  = "19,3",
url     = "https://publikationen.badw.de/de/003205006",
}