@Book{Schrank1814,
author  = "Schrank, Franz von Paula",
title   = "Ueber die blauen Schatten",
year    = "1814",
address = "München",
series  = "Denkschriften",
volume  = "[4,5] = 4 : Classe der Mathematik und Naturwissenschaften",
url     = "https://publikationen.badw.de/de/003900595",
}