@Book{Hertwig1892,
author  = "Hertwig, Richard von",
title   = "Ueber die Conjugation der Infusorien",
year    = "1892",
address = "München",
series  = "Abhandlungen",
volume  = "Bd. 17, Abth. 1 = [4]",
url     = "https://publikationen.badw.de/de/003083049",
}