@Book{Zittel1876,
author  = "Zittel, Karl Alfred von",
title   = "Ueber Coeloptychium. Ein Beitrag zur Kenntniss der Organisation fossiler Spongien",
year    = "1876",
address = "München",
series  = "Abhandlungen",
volume  = "Bd. 12, Abth. 3 = [8]",
url     = "https://publikationen.badw.de/de/003082978",
}