@Book{Lommel1899,
author  = "Lommel, Eugen von",
title   = "Theorie der Dämmerungsfarben",
year    = "1899",
address = "München",
series  = "Abhandlungen",
volume  = "Bd. 19, Abth. 2 = [4]",
url     = "https://publikationen.badw.de/de/006835785",
}