@book{238570,
	author = {Vries, Marc de. and Boersma, Kees. and Philips Natuurkundig Laboratorium.},
	title = {80 years of research at the Philips Natuurkundig Laboratorium (1914-1994)},
	publisher = {Pallas Publications,},
	year = {c2005.},
	address = {Amsterdam :},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10182195}
}