@Book{Hertwig1925,
author  = "Hertwig, Richard von",
title   = "Experimentelle Geschlechtsbestimmung bei Fröschen",
year    = "1925",
address = "München",
series  = "Sitzungsberichte",
volume  = "1925,7",
url     = "https://publikationen.badw.de/en/003390847",
}