@Book{Hertwig1899,
author  = "Hertwig, Richard von",
title   = "Ueber Kerntheilung, Richtungskörperbildung und Befruchtung von Actinosphaerium Eichhorni",
year    = "1899",
address = "München",
series  = "Abhandlungen",
volume  = "Bd. 19, Abth. 3 = [7]",
url     = "https://publikationen.badw.de/de/003071154",
}