@Book{Kobell1867,
author  = "Kobell, Franz von",
title   = "Ueber die Zwillinge des Chrysoberylls",
year    = "1867",
address = "München",
series  = "Sitzungsberichte",
volume  = "1867,1,20",
url     = "https://publikationen.badw.de/de/003393176",
}