@book{108897,
	author = {Downey, R. G. and ebrary, Inc.},
	title = {Aspects of complexity},
	publisher = {Walter de Gruyter,},
	year = {2001.},
	series = {De Gruyter series in logic and its applications ;},
	address = {Berlin ;},
	url = {http://site.ebrary.com/lib/rucke/Doc?id=10597936}
}