@Book{Baumhauer1874,
author  = "Baumhauer, Heinrich",
title   = "Die Aetzfiguren an Krystallen",
year    = "1874",
address = "München",
series  = "Sitzungsberichte",
volume  = "1874,4",
url     = "https://publikationen.badw.de/en/003391961",
}