@Book{Kobell1881,
author  = "Kobell, Franz von",
title   = "Polarisationsbilder an Zwillingen zweiaxiger Krystalle",
year    = "1881",
address = "München",
series  = "Sitzungsberichte",
volume  = "1881,12",
url     = "https://publikationen.badw.de/de/003395077",
}