@book{51640,
	author = {Hübl, Arthur,},
	title = {Die Lichtfilter},
	publisher = {W. Knapp,},
	year = {1921.},
	series = {Enzyklopädie der photographie,},
	address = {Halle (Saale)},
	edition = {2. vollkommen umgearb. Aufl.},
	note = {First edition published under title: Die photographischen lichtfilter.}
}