@Book{Unger1879,
author  = "Unger, Georg Friedrich",
title   = "Die römische Stadtaera",
year    = "1879",
address = "München",
series  = "Abhandlungen",
volume  = "15,2 : Abth. 1",
url     = "https://publikationen.badw.de/de/008530792",
}