@Book{Gümbel1868,
author  = "Gümbel, Carl Wilhelm von",
title   = "Beiträge zur Foraminiferenfauna der nordalpinen Eocängebilde",
year    = "1868",
address = "München",
series  = "Abhandlungen",
volume  = "Bd. 10, Abth. 2 = [10]",
url     = "https://publikationen.badw.de/de/003082928",
}