@Book{Haushofer1884,
author  = "Haushofer, Karl",
title   = "Beiträge zur mikroskopischen Analyse",
year    = "1884",
address = "München",
series  = "Sitzungsberichte",
volume  = "1883,20",
url     = "https://publikationen.badw.de/en/003394598",
}