@Book{Koenigswald1970,
author  = "Koenigswald, Wighart von",
title   = "Peratherium (Marsupialia) im Ober-Oligozän und Miozän von Europa",
year    = "1970",
address = "München",
series  = "Abhandlungen",
volume  = "144",
url     = "https://publikationen.badw.de/en/003028977",
}