@book{51668,
	author = {Schering, Helmuth, and Küpfmüller, Karl,},
	title = {Elektrische Beleuchtung,},
	publisher = {Akademische verlagsgesellschaft m. b. h.,},
	year = {1931.},
	series = {Handbuch der experimentalphysik ... Bd. 11, 3. t.},
	address = {Leipzig,}
}